Posts Tagged magnetic

A set of geophysics for Iron Oxide Copper Gold deposit in Quebec

Posted by on Thursday, 17 July, 2014
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Honey Badger Exploration Inc.  has completed the interpretation of the geophysical data over the Delhi Pacific copper showing on its Sagar Property. The coincident gravity, magnetic, electromagnetic (“EM”) and induced polarization (“IP”) anomaly associated with the Delhi showing are typical of those expected from an Iron Oxide Copper Gold (“IOCG”) deposit.

The IOCG model is further supported by the presence of a favourable structural setting for an IOCG deposit, namely the abundance of polymetallic showings (copper-gold-silver-cobalt) and the presence of diagnostically verified IOCG hydrothermal alteration.

At the Delhi Pacific showing, historical significant drilling intersections include 45.81 metres @ 0.51% copper and 10.7 metres @ 0.78% copper. While these intersections were not tested for silver, gold or cobalt, historic and recent grab samples* contain up to 1.8 grams per ton (“g/t”) gold, and up to 35 g/t silver.

*Grab samples are selective by nature and are unlikely to represent average grades of the deposit(s).

The selection of new drill targets is based on an interpretation of the IP/Resistivity, airborne magnetics, ground gravity and airborne EM data. In the winter of 2014 ClearView Geophysics Inc. completed a Surface Spectral IP survey over part of and extending east of the Delhi Pacific showing (Figure 1).

To view ‘Figure 1 – Surface Spectral Induced Polarization survey location lines’, please visit the following link:http://media3.marketwire.com/docs/honef10715.pdf

The interpretation indicates an anomaly associated with the historic drilling at Delhi that increases both in intensity and size east of these drill holes for more than 1.5 kilometres. The apparent resistivity data is presented in Figure 2 (red-purple indicates low resistivity and represents the target area):

Figure 2 – Resistivity Data at Delhi Pacific

The gravity data indicates that the southwest side of the magnetic high zone at Delhi Pacific coincides with a gravity low feature, whereas to the north is a gravity high. This indicates that the resistivity low/chargeability/electromagnetic target is located along a major structure that represents a favourable event for IOCG mineralization. The target area at Delhi covers more than 3 square kilometres: approximately 1.5 kilometres in strike length multiplied by an average width of 200 metres (Figure 3).

‘Figure 4 – Magnetic Inversion over Delhi Pacific’


IP and magnetic surveys in Ontario for gold

Posted by on Thursday, 26 June, 2014

HARTE GOLD CORP. (“Harte Gold”)CA:HRT -8.70% (frankfurt:H4O) is pleased to announce the completion of the expanded Phase Two Induced Polarization (“IP”) survey on the Sugar Zone Property, located 60 kilometers east of the Hemlo gold mines currently being operated by Barrick Gold Corporation.

Phase Two IP Survey

The survey was successful in identifying significant extensions to the five high priority IP anomalies located “up- ice” of the Peacock boulder train identified in the Phase One survey (see news release dated June 2, 2014). In addition, significant extensions to both the Wolf Zone and the Sugar Zone Deposit were discovered, as well as several new IP anomalies en echelon to each of the Wolf Zone and Sugar Zone Deposit. See attached map.

The five high priority IP anomalies were traced an additional 700 meters to the north. These IP anomalies are now 1,200 meters long while other parallel anomalies are 1,000 meters to 1,600 meters in length.

Magnetometer Survey

A detailed ground Magnetometer (“Mag”) survey has been completed over the entire grid covered by the two IP surveys. The Mag survey took readings every two meters and will assist in classifying the IP anomalies and help to define structures that are controlling mineralization and/or off-setting zones, as well as locate any younger mafic dikes (diabase dikes) that cut across the stratigraphy.

In the course of cutting and traversing the grid, many newly discovered rusty boulders have been located as well as other angular sericitic slabs. A program of detailed mapping, boulder tracing and sampling, and a limited till sampling program will be carried out over the next three weeks prior to drilling in order to properly prioritize drill targets. This occurrence of mineralized boulders suggests there may be a number of bedrock sources for any new mineralization. Every IP anomaly found in the survey area will be tested in order to confirm mineral content.


An exploration program on the Samaqua property (Quebec) with airborne and ground geophysics

Posted by on Thursday, 19 June, 2014

The property is located north of Girardville in the Saguenay-Lac-Saint-Jean region of Québec, Canada, close to the Crevier project.

Work will consist of a helicopter-borne geophysical survey and an induced polarization ground survey on a circular anomaly. MDN plans to carry out about 1,500 metres of drilling on the target once the geophysical surveys are complete. The goal of the exploration program is to confirm the presence of a carbonatite or an alkaline system with the potential to host niobium/tantalum mineralization.

The Samaqua property covers a magnetic geophysical response similar to the one associated with Niobec Inc.’s niobium mine. The magnetic signature lies 23 km southeast of the Crevier deposit and 130 km northwest of the Niobec mine. The magnetic response is circular in shape with a strong magnetic aureole surrounding a weak magnetic core, which is identical to the magnetic response of the Niobec mine. In the case of Niobec, the core corresponds to a niobium carbonatite with a rare-earth-rich centre.

The circular anomaly lies at the southeastern edge of a lineament visible on the regional geophysical survey maps of Quebec’s Ministère de l’énergie et des ressources naturelles (see map). The northwest end of the lineament coincides with the porphyry syenite dike that hosts the Crevier niobium /tantalum deposit, and the southeastern extension of the lineament could be the southeastern extension of the dike, which would connect the two systems.

The results of interpretation suggest that the magnetic signature to the southeast of the Crevier deposit could correspond to other carbonatite-type mineralization with a niobium or rare-earth centre. Furthermore, these would be related to the Crevier deposit by the lineament that could be the southeastern extension of the Crevier dike. The Samaqua intrusive is part of the Saguenay-Waswanipi structural corridor that includes the Saint-Honoré carbonatites (Niobec) and Crevier alkaline complex in the Grenville region and the Lac Shortt and Montviel carbonatite in the Abitibi region.

Map: Magnetic geophysical response of the Sasguenay-Waswanipi structural corridor 

Samaqua

Geology and mineralization

The property occurs in the Grenville geological province.  According to the regional geological map published by the Quebec government, the northern part of the property is underlain by migmatite and granitic rocks, including pegmatite, whereas the southern part is composed largely of coarse-grained porphyritic mangerite, an intrusive rock of intermediate composition typically found in metamorphic terranes of Proterozoic age like the Grenville.

The property occurs just to the SE of the Crevier Nb-Ta deposit, along the projected extension of the nepheline syenite dyke that hosts approximately 25.39 million tonnes (Measured + Indicated) at 1960 ppm Nb2O5 and 2349 ppm Ta2O5.  Historical prospecting work located pegmatitic syenite outcrops on the property, which are highly indicative of the presence of an alkaline intrusive favourable to metals like those at Crevier (niobium-tantalum) and /or Niobec (niobium and rare earths).


Six Graphite-Rich Zones at Buckingham Graphite Property, Quebec after airborne and ground geophysics

Posted by on Monday, 9 June, 2014

CAVAN VENTURES INC.  announces it has exposed graphite-rich zones as a result of trenching on its 100%-owned Buckingham graphite property, located adjacent to the historic Walker Graphite Mine in Buckingham Township, Quebec. Graphite-rich zones were exposed in six trenches, and channel samples were collected from two trenches over a combined distance of 59.5 meters. Graphite-rich outcrops at the same location as one of the trenches assayed at 21.7% C.

Peter Swistak, President of Cavan states, “We are extremely pleased that many of our airborne EM anomalies identified last year are now confirmed as graphite mineralization. Our ground geophysics was able to confirm the anomalies in real-time, which allowed us to quickly expose the mineralization and collect samples for assay. We anticipate highly positive results and intend to return for further exploration in the coming weeks.”

In May the Company engaged Magnor Exploration Inc. (La Baie, QC) to conduct a short exploration work program. Ground-based geophysics was used to ground-truth airborne EM anomalies identified last year using the PhiSpy portable TDEM system. PhiSpy generates real-time EM profiles of the area being surveyed, and can detect buried conductors to approximately 10m depth. Dube & Desaulniers Geoscience (Ottawa, ON) was engaged to collect 3.3 line-km of survey data over priority airborne EM anomalies using the PhiSpy system. The real-time interpretation of TDEM data allowed the Company to execute trenching on several high priority targets.

A total of six trenches ranging from four to 48 meters in length and two meters in width were completed. Trench 22C was cut for 24 meters in a northwest direction, with a second perpendicular trench cut at its southeast end for 20.5 meters. Graphite-rich zones were exposed in both directions, and channel samples were collected over most of both trench lengths for a total of 33.9 meters. Mineralization at Trench 22C is still open to the north, with some visible flakes in the trench up to one centimeter in diameter. A rock grab sample assayed previously from this location returned 21.7% C (see news release, July 8, 2013). Trench #1 was cut in a west-northwest direction, with visible graphite channel-sampled over 25.6 meters. Because of the rich nature of the mineralization, these samples and those from Trench 22C were immediately shipped for assay.

A new graphite zone was also discovered roughly 150 meters east of Trench 22C, where graphite-rich veinlets in granitic-pegmatitic rocks contain graphite flakes over 5 mm in diameter. Additionally, an airborne anomaly approximately 400 meters north of the main set of conductors was confirmed by PhiSpy, but the program ended before this new target could be tested through trenching.


IP geophysical survey in the Lake Victoria goldfield of Tanzania

Posted by on Monday, 9 June, 2014

Tembo Gold Corp. (TSX VENTURE:TEM) (FRANKFURT: T23) (“Tembo” or the “Company”) is pleased to report progress on its 2014 work program on the Buly Trend target area on the Tembo Property in the Lake Victoria goldfield of Tanzania. A first drill hole has tested the Buly trend in the vicinity of artisanal workings and an IP geophysical survey has been completed and an initial diamond drill hole through a resulting significant anomaly has commenced. This anomaly is located along the interpreted projected extension of the structure that hosts the Reef 1 orebody at Bulyanhulu Mine.

IP Geophysical Survey
Spectral Geophysics has recently completed an IP survey measuring chargeability and resistivity. The survey was designed to probe to depths in excess of 800m, over a grid adjacent to the Bulyanhulu-Tembo boundary. Initial 200m spaced northeast oriented lines identified areas of interest over which the line spacing was closed to 100m to improve the 3-D model resolution.

The IP survey has revealed a weak sub-vertical chargeability anomaly, developed to a depth exceeding 650m along the Reef 1 trend commencing some 1500m from the boundary with the Bulyanhulu mining licence. This anomaly weakens slightly towards the northwest but approximately 400m further in this direction it strengthens significantly, particularly at depth and for 700m to the northwest to the end of the surveyed grid. The geophysical interpretation indicates that the chargeability response is increasing towards the end of the grid and becoming shallower and is open in that direction. The 3-D modeling of the geophysical response has provided the necessary information to plan initial test drill holes.

A second chargeability anomaly is located approximately 500m to the north, extending in depth from -50m to -450m where it becomes weaker. This anomaly extends some 600m along a northwest trend, parallel to the anomaly that is now being drilled.

Highlights of the Buly Trend work program include:

  • A strong magnetic lineament characterizes the interpreted extension of the structure hosting Reef 1 at Bulyanhulu Mine;
  • A 200m artisanal working is located along this trend;
  • TDD0001, drilled through this lineament beneath the workings, intersected a strong broad brittle-ductile shear zone with associated quartz veining but little sulphide and minor Au;
  • Initial IP has revealed a strong chargeable and resistive zone along strike at depth to the northwest along the trend at the Ngula 2 target, which has a highly active artisanal working located immediately to the northeast at surface;
  • The Ngula 2 target has consistently returned high grades from grab samples of the artisanal production: and
  • Drilling of the first drillhole to test the IP chargeability anomaly has commenced.

David Scott President & CEO stated, “The Buly Trend has for very obvious reasons always been considered an important target for the Company. The initial drillhole confirmed that at least one and probably more major shear zones are present in this area and appear to relate directly to the northwest extension of the Bulyanhulu system. The just-completed IP survey now provides us with strong evidence of potential sulphide mineralization possibly associated with a strong shear structure along this same Buly trend. The outcome of the first drillhole testing the chargeability zone is eagerly anticipated. “

Geology of the Buly Trend
The geology of the Bulyanhulu Mine sequence trends northwest into the Tembo licence area. Two northwest-trending structures that host the resource at Bulyanhulu (Reef 1 and Reef 2 450-500m apart), are believed to continue in a northwesterly direction through the boundary separating the properties. Reef 1 is located in a brittle-ductile shear structure located largely within an argillaceous meta-sediment on a mafic-felsic metavolcanic contact. A number of other sub-parallel magnetic lineaments are evident across a broad northwest-striking metavolcanic sequence. These structures commonly occupy contacts between individual lithological units consisting of stacked metavolcanic flows, alternating mafic and felsic meta-volcanic rocks and associated meta-sediments.


Complex interpretation of geo data for Eskay Creek style mineralization in BC

Posted by on Tuesday, 6 May, 2014

Dolly Varden Silver Corporation announces the results from its geophysical program at the Dolly Varden property in Northwestern BC. The geophysical models further confirm drill targets for the Company’s proposed 2014 drill program and identify several new targets.

The newly compiled geophysical data outlines key horizons at depth and other surface anomalies that are coincident with known mineral showings, geochemical and structural targets already identified on the Dolly Varden property.

Dolly Varden

The combination of airborne MAG, VTEM, ZTEM radiometric, and geochemical data, along with geological and structural mapping, was used to define priority target zones. These helped define steep linear features, syngenetic faults, lithologic contacts related to basin formation, and key fluid controlling structures. In addition, key rock units, contact zones and alteration zones most likely to be associated with mineralization, were identified.
This compilation has demonstrated that the known deposits, showings, and related alteration zones are all located within a rift setting. The key rock units that infill the rift have also been identified, and these represent viable targets for Eskay Creek style VMS mineralization. Drilling will be conducted within corridors where mineralized occurrences and coincident alteration haloes point to extensive hydrothermal fluid flow. The key target areas for 2014 drilling include syngenetic VMS-style mineralization and associated feeder structures.

To view the image accompanying this press release, please visit the following link: http://media3.marketwire.com/docs/DV506-F1.pdf or visit www.dollyvardensilver.com.

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The review of all available geophysical models identified six targets that are being recommended for follow-up work. Three of these targets are new and are located near the northern boundary of the Dolly Varden property and three of the identified targets confirm existing targets that are already scheduled for drilling in 2014.

The geophysical data adds information about the geometry and outlines the contacts between two key geologic horizons. In particular, the geophysics tracks the DVT Horizon to the north and under the Red Point area. Prior drilling on the DVT Horizon has intersected high grade silver mineralization that remains open to the north. The geophysics was also successful in outlining the Salmon River Formation that is prospective for Eskay Creek style mineralization. The geophysical results are congruent with, confirm, and add additional information to the targets slated to be drilled in 2014.

Further, the geophysical results indicate several new targets that have the potential for additional Eskay Creek style accumulations. These newly developed targets are located on the underexplored northern section of Dolly Varden’s property. The area is several kilometers to the North from the existing historical workings and abuts neighbouring exploration properties controlled by Homestake Resource Corporation and the Homestake – Agnico Eagle Mines joint venture.

The three targeted corridors are the 1) Torbrit-Red Point Corridor – following known silver mineralization underneath Red Point, an Eskay-Creek style target; 2) Musketeer Corridor – which runs along the east side of the Kitsault river with numerous Ag-rich epithermal vein-type showings with strong potassic radiometric signatures; and 3) Wolf-Surprise Corridor where an Eskay-Creek style host formation containing silver-rich VMS mineralization was identified by the Company’s 2011 drill program.

Geology

The geology underlying the Dolly Varden property consists of volcano-sedimentary rocks belonging mostly to the lower and middle Jurassic Hazelton Group. These include intermediate volcanic and volcaniclastic rocks of the Betty Creek Formation and bimodal volcanic and sedimentary rocks of the Salmon River Formation.

The principal silver-base metal deposits of the Kitsault River valley have been interpreted as vein mineralization by early workers. Devlin (1986) reinterpreted the main deposits to be volcanic exhalative in origin. Deposits of this type are formed as sub-aqueous hot-spring type deposits on the seafloor, as products of hydrothermal solutions that have vented from sub-seafloor fracture and fault systems. Furthermore, the silver deposits of the upper Kitsault valley are mapped with important geological similarities to the Eskay Creek deposit, providing an analog for exploration on the Property.


Magnetic/VLF survey in the Chibougamau area in Quebec

Posted by on Tuesday, 6 May, 2014

 Stellar AfricaGold Inc. announces that an airborne Magnetic/VLF survey has been completed over the Opawica and Philibert I properties in the Chibougamau area in Quebec. An exhaustive interpretation done by MB Geosolutions inc., has outlined (8) gold and (3) Cu-rich polymetallic exploration targets. The interpretation was done by analysing current survey data in association to existing INPUT EM combined with Cu till anomalies from public data sources. Two of the copper targets are located in the Opawica South Block and one in the Philibert I Block. Four (4) gold targets are located in the Opawica North Block, three (3) in Opawica South Block and one (1) target in Philibert I Block.

The Company is now planning the spring/summer reconnaissance over Opawica and Philibert I property with an emphasis on the evaluation and sampling of the targeted area. A ground IP survey should be recommended to better outline the targets that are not outcropping. Trenching and drilling should follow during summer program over selected targets.

About OPAWICA and Philibert I Property:

The Opawica and Philibert 1 properties are located in the Chibougamau-Chapais mining camp within the Tomagold/Iamgold-Vanstar-SOQUEM working area which is to date the most active exploration camp in Quebec. Among the most important gold occurrences reported in the area, we note SOQUEM Meston Lake deposit (1.2 MT @ 6.25 g/t Au), SOQUEM Philibert deposit (1.3 MT @ 5.32 g/t Au), as well as numerous high grade drill and channel sampling reported by Tomagold, Vanstar, Murgor and SOQUEM as well as the former Joe Mann gold mine that produced over 1.0 million ounces of gold.

The OPAWICA Property consists of three blocks totalling 80 mining cells recently acquired by Stellar in the area of the new Liam gold discovery of the Nelligan Project of Vanstar. The Philibert 1 property is composed of one block of four mining cells and is part of the same area.

The Philibert-I showing was discovered in 1983 by prospection, and consists of a gold mineralization associated with quartz-tourmaline-sulphides veins. Historical exploration reported grades of 31.6 g/t Au and 2.54 g/t Ag in channel sampling across exposed quartz veins, and of 18.66 g/t Au over 0.6-metre cuts in a drill hole.


Airborne and ground geophysics for precious metal project in Mexico

Posted by on Monday, 5 May, 2014

Orex Minerals Inc. announces completion of an airborne geophysical survey at its Los Crestones precious metal project, Sinaloa, Mexico. The 4,168 hectare helicopter-borne radiometric and magnetic survey was flown at 50m line spacing by MPX Geoservices Ltd. Data are being processed and results are expected in the coming weeks. In addition, Orex has signed a contract with Quantec Geoscience Ltd (“Quantec”) to undertake an 18 line-kilometre TITAN 24 DCIP (Direct Current resistivity and Induced Polarization chargeability) ground geophysical survey.

The proposed survey comprises 5 lines, each 3.6km long and 400m apart and will be the first ground geophysical survey to be conducted at Los Crestones. During the work Quantec will also collect MT (Magnetotelluric resistivity) data on the central grid line. Scheduled to commence mid-May, the survey is centred over mineralized structures previously tested by shallow diamond drilling in 2011. Orex expects the results to augment existing geophysical, geochemical and geological datasets and intends to use the results to identify additional areas for drill testing later in 2014. Surveying and clearing of grid lines is currently underway.

According to Orex’s President, Gary Cope, “The known mineralized structures may be only a portion of the bigger picture at Los Crestones. Utilization of airborne and deep penetrating surface geophysics at this stage of exploration will allow our geological team to refine drill targets for testing in the latter half of 2014. “

The property was drilled previously by Astral Mining Corporation (“Astral”) now merged with Orex (news release February 12th, 2013). In late 2011 Astral completed 2,618m of HQ and NQ diameter core drilling in 18 holes. Drilling tested three mineralized structures which outcrop at surface. Significant intercepts were identified in many of the holes and may be viewed at www.orexminerals.com/s/Drilling-LosCrestones.asp. Reported results included a best intercept of 5m averaging 39.1 g/t Au, 93.3 g/t Ag and 2.13% Cu from 55m depth in HQ drillhole 11LD011. True width of this interval from the Bohemia structure is approximately 3.53m.

LOS CRESTONES GOLD-SILVER-COPPER PROJECT SINALOA, MEXICO

The Los Crestones project totals 4,168 hectares and is prospective for economic gold, silver and copper mineralization. Mineralization includes north-south oriented structural zones hosting quartz veins, quartz stockworks and breccia fill possibly related to a deeper porphyry and/or diatreme system. Three main structural zones were targeted in the first phases of work. Corona, Bohemia and Indio are elongate structures recognized on surface as erosion-resistant silicified ribs or “crestons”. The airborne and ground geophysical programs commissioned by Orex are designed to complement ongoing geological mapping and geochemical sampling. Orex intends to develop drill targets over the summer; diamond drilling is scheduled for late 2014.

Geology and Mineralization

The property is underlain primarily by volcanic and intrusive rocks. At lower elevations andesite and dacite are seen within an erosional window in creeks and drainages and are representative of the “Lower Volcanic Sequence” commonly recognized throughout western Mexico. At higher levels the sequence is capped by rhyolites of the “Upper Volcanic Sequence”. Felsic to intermediate intrusive rocks are also observed over a large proportion of the property. The INEGI 1:50,000 G13-C12 map sheet depicts two intrusive bodies on Los Crestones though Orex geologists have observed outcropping intrusive material across the property.

Mineralization is concentrated within a series of silicified, north-south trending quartz stockwork and breccia zones most prominent in the southern half of the property. Three structures subject to the most work to date are named “Corona”, “Bohemia” and “Indio”. Historically these structures have been tested in small pits and underground workings, many of which are still accessible today, the largest comprising some 40 m of development. Additional mineralized structures have also been identified and require follow up work.


Supervised Neural Network Targeting and Classification Analysis for Mineral Exploration

Posted by on Tuesday, 29 April, 2014

Karl Kwan (Geotech LTD) presented at Canadian Exploration Geophysical Society meeting (8 April 2014) methodology and examples of using Neural Network Targeting and Classification at mineral exploration.

“Geophysical survey contractors routinely offer multi-parameter data to clients. For example, a helicopter-borne survey may acquire Time-domain electromagnetic (TDEM), magnetic gradiometer and even gamma-ray spectrometer data (i.e., VTEMplus, Geotech LTD). Exploration geophysicists can certainly take advantage some of the readily available multi-disciplinary (geology, geophysics and remote sensing) and multi-parameter (potential field, EM, gamma-ray spectrometry, and others) datasets for mineral exploration. However, the integration and interpretation of these datasets can be time-consuming and even challenging, especially for large-scale datasets covering large areas with diverse geological conditions. The Supervised Neural Network (NN) Targeting and Classification technique for mineral exploration described and demonstrated by Reford, Lipton and Ugalde, 2004, “Predictive Ore Deposit Targeting Using Neural Network Analysis” (http://www.pgw.on.ca/downloads.html), can be a useful and promising tool for the analysis of multi-disciplinary and multi-parameter data.

In this presentation, the properties or responses of the two feed-forward multilayer Neural Networks, Levenberg-Marquardt (NN with LM training) and Fast Classification (FCNN), as implemented in the current version by PGW, are studied in detail. The supervised NN simulations are performed on specially constructed synthetic data. Intended as a tutorial and the NNs treated as black boxes, the objectives of the exercise are twofold, to demonstrate the targeting as well as classification capabilities of the Neural Networks, and at the same time to show one of the known limitations and to suggest a way to get around it. The utility of the NN tool is demonstrated again with real cases from the Republic of Niger.”

Geosoft is delighted to host the online portion of the Canadian Exploration Geophysical Society meeting with keynote speaker Karl Kwan, Geotech LTD.

YouTube:  


Magnetic Survey Identifies extra length of Potential Strike in Arizona

Posted by on Friday, 11 April, 2014

 Patriot Gold Corp.  a developing gold and silver exploration and production company, announces the results of an airborne magnetic survey of its Moss Gold-Silver project located in the historic and active Oatman Mining District near Bullhead City, Arizona. Results of the survey included use of magnetic, field mapping and historic mineral and workings data.

  • The main Moss resource and hosting structure lies along a well-defined magnetic high and includes three kilometers of unexplored potential on one structure.
  • Nine magnetic linear anomalies associated with know mineral occurrences and historic workings were found as part of the Moss structure, indicating potential for hosting new discoveries along these structures.
  • One structure includes nearly six kilometers of a mapped extension of the Gold Road deposit which previously produced nearly 500,000 ounces at 0.32 opt gold.
  • The implications of the new data indicate that the exploration potential of the Moss site is very good and that there is the likelihood of further discoveries on the Moss property.
  • Following the interpreted results of the survey, the Company’s partner Northern Vertex Mining Corp., is currently designing an exploration program to assess the potential of the additional structures identified that would run concurrently with Phase II – Operations Phase of the Moss project plan.

The survey found a total of 21 kilometers of potential strike length along the entire Moss Mine property. In addition, several other linear magnetic lows and highs were found that would require ground work to determine if they are mineralized.

In June 2013, a preliminary economic assessment of the Moss Mine Project, which did not include the current survey results, assessed the measured and indicated gold equivalency of the site at 654,000 ounces with an inferred resource estimate of 82,000 ounces.

“While the results of the survey are preliminary at this stage, this type of mapping has been the foundation for many successful early stage exploration programs,” said Bob Coale, CEO of Patriot Gold. “Considering that the historic production in the Oatman District previously exceeded 2 million ounces of gold production, we believe the survey results highlight the Moss Gold-Silver project’s high potential for additional gold discoveries which could further increase the value of this property.”

Geology of the Moss Mine Property

The project area is underlain by Tertiary quartz monzonite (a coarsely crystalline rock composed primarily of quartz, plagioclase and orthoclase) intruding Tertiary age volcanics. Precambrian basement rocks underlie the volcanics. The veins consist of quartz-calcite and lesser adularia. The Moss vein system is up to 45 feet thick and can be traced on surface for over a mile. The hanging wall of the main vein commonly has several tens of feet of stockwork veining. Dipping 40-60 degrees to the south from a high ridge, the quartz-calcite veins and stockworks are being drilled as a bulk minable gold target. Based on the results to date, Patriot believes the Moss Mine project has the potential for an economic resource of leachable gold and silver in the order of one million ounces of gold equivalent.


Integrated airborne geophysics and geologic data interpretation for new Eskay-Creek style deposits

Posted by on Wednesday, 9 April, 2014

Dolly Varden Silver Corporation announces that through recent geoscience modeling and ongoing interpretation, the Company has focused its primary advanced exploration target areas on three corridors within the Dolly Varden property. Work is now being done to prioritize the most prospective drill-ready targets within these corridors. The corridors and targets were chosen for their potential to best expand areas of known high-grade silver mineralization and to identify new Eskay-Creek style precious metals deposits.

 

 The three targeted corridors are the 1) Torbrit-Red Point Corridor – following known silver mineralization underneath Red Point, an Eskay-Creek style target; 2) Musketeer Corridor – which runs along the east side of the Kitsault river with numerous Ag-rich epithermal vein-type showings with strong potassic radiometric signatures; and 3) Wolf-Surprise Corridor where an Eskay-Creek style host formation containing silver-rich VMS mineralization was identified by the Company’s 2011 drill program.

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Through recent modeling and ongoing interpretation, the Company has now moved from kilometer scale targeting to meter scale targeting within these defined corridors. The Company’s technical team is working to delineate specific drill ready targets within these corridors. An aggressive 40 to 50 hole (13,500 meter drill program) is being finalized, subject to financing.
The combination of airborne MAG, VTEM, ZTEM radiometric, and geochemical data, along with geological and structural mapping, was used to define priority target zones. These helped define steep linear features, syngenetic faults, lithologic contacts related to basin formation, and key fluid controlling structures. In addition, key rock units, contact zones and alteration zones most likely to be associated with mineralization, were identified.
This compilation has demonstrated that the known deposits, showings, and related alteration zones are all located within a rift setting. The key rock units that infill the rift have also been identified, and these represent viable targets for Eskay Creek style VMS mineralization. Drilling will be conducted within corridors where mineralized occurrences and coincident alteration haloes point to extensive hydrothermal fluid flow. The key target areas for 2014 drilling include syngenetic VMS-style mineralization and associated feeder structures.

Coincident Geochemical and Geophysical Data Pinpoints Drill Targets, Greyhound, Nunavut

Posted by on Saturday, 1 March, 2014

Aura Silver Resources Inc. announces the results of a comprehensive report completed by L.E Reed Geophysical Consultant Inc. (“Reed”) which supports, from a geophysical standpoint, drill targets established geochemically by Activation Laboratories Ltd. (Actlabs) Spatiotemporal Geochemical Hydrocarbon (“SGH”) technology for the Aura Lake area as well as the Dingo prospect north-west of Aura Lake, both part of the Greyhound Project, NU.

As reported by Reed, “Correlations between the geochemistry and various geophysical data suggest support for the possible identification of gold and silver deposits at Aura Lake and a gold and copper deposit at Dingo”. This report may be accessed at the Company’s web-site (http://www.aurasilver.com/s/Home.asp) under the section Projects / Canada.

The potential sources of high-grade gold boulders (up to 28 g/t) and high-grade silver (up to 5,300 g/t) have been identified in close proximity to Aura Lake. The gold and copper targets at the Dingo prospect area north-west of Aura Lake are surface showings. New interpretation of geophysical data and SGH has refined the drill targets. This geophysical analysis has identified multiple structures/contacts with the use of three-dimensional inversion imagery of airborne VTEM EM and magnetic responses and ground Induced Polarization and Resistivity data. These structures/contacts at Aura Lake may have provided a pathway for fluids carrying mineralization and are interpreted to support the drill targets originally defined by geochemical analysis.

Robert Boaz CEO and President of Aura Silver states that, “The detailed geophysics analysis undertaken by Reed gives us further comfort that we are zeroing in on the source of high-grade surface gold, silver and copper mineralization. Despite the difficult market for all junior exploration companies we continue to enhance the value of our properties.”

During the fall of 2006, an airborne MEGATEM® geophysical survey was flown on the initial property by Fugro Airborne Surveys Corp. In 2007, further prospecting of MEGATEM anomalies took place. Samples collected in 2007 contained up to 2.4% zinc (Zn), 1.02% copper (Cu), 8.1% lead (Pb), 10g/t gold (Au) and 51 g/t silver (Ag) highlighting the potential for discovery of VMS (volcanogenic massive sulphide) ores.

During 2008, Fugro completed the flying of a GEOTEM® survey over the new Greyhound claim group. Results from this survey were utilized in an on-the-ground field program to complete geological mapping and sampling. Samples prospected during 2008 contained up to 4.1% Cu, 13.4% Zn, 8% Pb, 2,700 g/t Ag and 28g/t Au and to the northeast of Aura Lake a series of boulders contained up to 18.5% Zn and 9.2% Cu.

In late 2009, a high precision VTEM® helicopter borne electro-magnetic survey was completed.


The renewed Interest in Pecors Magnetic Anomaly-Serpent River Property Near Elliot Lake, Ontario

Posted by on Friday, 21 February, 2014

International Montoro Resources Inc. – The Serpent River Property, Elliot Lake, Ontario claims consist of 10 mining claims (115 units) covering approximately 1,840 hectares located in Gaiashk & Joubin Townships. Recent renewed interest has been shown in the 3 upper northwest claims known as the Pecors Anomaly. Click following for maps/regional geophysical overview http://ow.ly/tNTbz.

Montoro congratulates Kelly Strong, V.P. of Ontario and UK Operations -Vale, in the recent startup of the Totten Mine (Totten lies 40 km to the west of Sudbury and approx. 50 km from Pecors). This is Vale’s sixth operating mine in the Sudbury Basin. A polymetallic orebody with good nickel and copper grades as well as precious metals. Click following for the complete story: http://ow.ly/tLq2T. (See page 1 & 19-34 re the Totten Mine and page 15 re the KGHM Victoria Mine Projects)

The Uranium and Rare Earths discovered in the southwest portion at Serpent River may prove to be a sideshow to another deposit type. In a 2009 summary of the Ontario Geological Survey field work, a strong geophysical anomaly on the claims that was previously thought to be caused by an iron formation was reexamined. The new interpretation on the Pecors anomaly concludes it may be the result of contact style nickel-copper-PGE mineralization similar to that found to the east at Sudbury. Sediment sampling from Pecors Lake has shown high levels of nickel and chromium, lending further weight to this analysis. The total field magnetic anomaly strikes northwesterly and is about 15 km long and about 4 km wide.

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Exploration & Development of the Pecors Anomaly:

  • Int. Montoro, Pele Mtn. & Verbina Resources completed a combined VTEM survey in January 2008. An operational report for this survey was written by the contractor Geotech Ltd. in February 2008, Project 7112.
  • 2009 Ontario Geological Survey field work completed- Open File Report 6240; Project Unit 09-004. Compilation Mapping, Pecors-Whiskey Lake Area, Southern and Superior Provinces
  • February 23, 2010 brief prepared by G. Campbell, MSc. – ‘The Pecors Magnetic Anomaly located under Huronian Cover – A Possible Cu-Ni-PGE Target at the Archean-Proterozoic Boundary, Elliot Lake Area
  • May 5, 2010; Int. Montoro commissioned a report on the southern claims group of the Serpent River Property from L.E. Reed Geophysical Consultant Inc.
  • May 20, 2011; Int. Montoro initiates a search for and locates 4 historic boreholes PW #116, 117, 121 & 122 drilled by Rio Algom in 1959 on the eastern side of Pecors Lake. Holes PW 121 & 122 drilled along the south and southwestern edge of the Pecors Anomaly, penetrated the Huronian sediments and encountered underlying basement rocks at depths of 2002 feet (610 meters) and 1477 feet (450 meters) respectively. Information from the drill holes provides some corroboration of the depths from the 3D model as reported in the July 6, 2011 report following.
  • July 6, 2011; Int. Montoro commissions a report ‘Response of the Pecors Magnetic Anomaly‘ from L.E. Reed (“Reed”) Geophysical Consultant Inc. Reed ran the anomaly through a 3 dimensional inversion program (UBC, Mag3D) to develop an understanding of the three-dimensional shape and distribution of the source body for this anomaly. Measurements through a section in the center of the anomaly show a depth of 300 to 400 meters to the top and as much as 1700 meters from surface to the bottom of the magnetic source body. It appears as a broad sill, possibly an intrusion. The maximum dimensions of the entire inversion block are estimated at 7.8 km EW x 3.45 km NS and 2.025 km from surface. Select portions of the Reed Interpretation report are posted on the updated Serpent River project page on the Company website at www.MontoroResources.com
  • February 2014; Int. Montoro is actively engaging stakeholders in the Sault St. Marie & Sudbury Mining Districts to proactively move forward the exploration of the Pecors Magnetic Anomaly.

Other:

Neighboring explorer, Pele Mountain Resources (TSX VENTURE:GEM), has provided the results of an updated economic review of its Eco Ridge Mine rare earth and uranium project in Elliot Lake, Ontario. In its news release dated September 12, 2013, Pele Mountain reports the economic review concludes that the recent increase in mineral resources extends mine life and improves project economics. While this improvement is offset by a reduction in rare earth price forecasts, the net result demonstrates that Eco Ridge economics remain positive.

Int. Montoro is also seeking interested parties in continuing the development of the Serpent River southern portion of its rare earth and uranium property adjoining Pele Mountain’s claims east of Eco Ridge.


Geophysical exploration program in Nicaragua

Posted by on Tuesday, 18 February, 2014

Caza Gold Corp. announces that the Company has initiated the 2014 exploration program at the Los Andes and Pochote properties in Nicaragua. The Company is planning a large airborne geophysical survey and a drilling program which will test 2 of the highest priority gold targets.

Plans are underway to complete a geophysical survey along a 12 kilometer long trend of continuous alteration within the Los Andes and Pochote claims, followed by a drilling program to test two gold targets not previously drill tested during the 2012 Pedregal program. The upcoming drilling will test the Quisaltepe and San Francisco gold zones. Access agreements have been obtained for the San Francisco area and drill access road construction is underway. Negotiations for access in the Quisaltepe area are being finalized. The drilling program is expected to begin, pending contractor scheduling, by April and is planned to complete approximately 10 to 15 holes each 200 to 250 meters deep. A dedicated budget of approximately CDN$1.3 million has been set aside from the proceeds of the December 2013 CDN$2.5 million financing to execute the exploration program.

The Company has contracted Aeroquest Airborne to complete the helicopter based geophysical survey which will cover approximately 36 square kilometers over the Pedregal, Quisaltepe and San Francisco gold targets acquiring versatile time domain electromagnetic (VTEM) and magnetic data along approximately 530 line kilometers at 100 meter line spacing. The survey is scheduled to begin in March pending the importation of the survey equipment and final scheduling of personnel and equipment. Geophysical survey results in conjunction with geochemical results, structural and alteration mapping will further define the drilling locations.

The VTEM and magnetic data are targeting the conductive massive sulfide horizons and the resistive silicified zones associated with large faults and possible areas of gold mineralization. The magnetic portion of the survey will provide additional information identifying the fault zones and deeper porphyry style mineralization and intrusive bodies. The survey will cover the Pedregal area, drilled in 2012, which intersected thick horizons of sulfide mineralization and strongly silicified zones with elevated but sub- economic gold concentrations (refer to Nov. 29, 2012 news release for details) and along the 10 kilometer trend to the San Francisco target at the south end of the zone.

Los Andes High Sulfidation Gold Property, Nicaragua

The Los Andes Property is located approximately 1 hour east of Managua on Highway 7 with excellent access. The property covers approximately 6,575 hectares and is strategically located within the Central Nicaragua Gold Belt between the El Limon and La Libertad Mines of B2 Gold.

The Los Andes property is a high-sulfidation style of gold mineralization.  High-sulfidation gold systems host some of the largest gold deposits in the world with examples such as Yanacocha and Pierina in Peru.  Favorable alteration and mineralization has been traced along the regional northeast trending Los Andes structure for at least 11 km on the Los Andes property.  The extensive alteration system is exposed on the surface and consists of very strong silicification associated with zoned alteration from higher temperature advanced argillic zones surrounded by successively lower temperature argillic, and propyllitic alteration.  The alteration is associated with anomalous values of gold, silver, and highly anomalous levels of indicator metals such as bismuth, tellurium, selenium, arsenic, antimony, and mercury.


The first airborne EM survey over Tireo gold belt in Dominican Republic

Posted by on Friday, 14 February, 2014

GoldQuest Mining Corp. has commenced flying a helicopter borne ZTEM geophysical survey covering its’ 100% owned Tireo Concessions. The geophysical survey is the first Electro Magnetic survey ever flown over this belt, and will include a high-sensitivity cesium vapour magnetometer for mapping geologic structure and lithology.

 “Results from this survey will complement the PEA underway at our Romero discovery, providing significant newsflow over the next year,” commented Julio Espaillat, GoldQuest’s CEO, “ZTEM has been selected in light of our knowledge gained at the Romero discoveries. This allows us to quickly evaluate the complete area to depths beyond 1 kilometer. We are confident that if there are other similar hydro thermal systems in our large Tireo concession areas, we will identify them with this state-of-the-art system.”

The map link to: http://goldquestcorp.com/images/press_release/GQC_TireoBeltExplorationMap.jpg

Shows the extent of the ZTEM survey, surrounding our Romero discovery where the maiden technical report describing a multi million ounce gold equivalent resource was filed on December 17, 2013.

Geotech Limited of Canada is flying the ZTEM and magnetometry survey over all of GoldQuest’s concessions in the Tireo Formation, totaling approximately 3,000 line kilometers, at a combination of 100 and 200 meters line spacing. The survey will improve the understanding of the geology and mineral potential along the Tireo trend, and will provide insight into the conductivity, magnetism, alteration and structure of the belt, in light of the Romero discoveries, which will be covered as part of the survey. The data will complement the induced polarization, ground magnetic, mapping and sampling programs which has generally been confined to an area within 5 kilometers of Romero, leaving the majority of the 60 kilometer strike length of the Tireo Concessions unexamined to date. The survey covers areas that have been granted to GoldQuest, and those areas under application.

The Company’s 2014 approved budget for the Tireo Project covers the exploration of the Tireo Formation in the Dominican Republic, and includes this airborne survey, ground follow up and drilling of any anomalies in 2014.

 


Planned airborne geophysical survey looking for an economic graphite deposit at Blackflake property

Posted by on Monday, 10 February, 2014

Xmet Inc. announces that it has engaged Aeroquest International to complete a new round of Versatile Time Domain Electromagnetic (“VTEM”) and Magnetic Gradiometer Survey on its newly acquired 20,000 acres of 100% owned claims which expanded Blackflake’s total area to 29,400 acres. The airborne survey will begin in the next few days.

“This will be our third round of EM aerial surveys and with the exploration success Xmet achieved with its first two EM surveys, we are excited about the potential for this next round of VTEM,” said Xmet’s Chairman and CEO Alexander Stewart.

He continued by saying, “Our primary objective remains to drill test our prime anomaly, disclosed in our news release of December 12, 2013, for which permits for ground geophysics and drilling are expected to be received this month. However this newly acquired land and the further upside potential that the VTEM can deliver is equally exciting.”

Embedded in this news release is a MAP depicting Blackflake’s Eastern Claim Block. As per the map’s legend, the yellow portion within Xmet’s claim block denotes Xmet’s land package prior to January 30th, 2014 News Release and the horizontal grid lines within Xmet’s claim block denotes the 20,000 acres of new claims staked along with the area that will be flown in this round of VTEM.

To view the map accompanying this press release please click on the following link: http://media3.marketwire.com/docs/XME0204.pdf

Bill Yeomans, P. Geo, states, “Given the highly conductive nature of graphite deposits, VTEM is a very effective method for locating potential graphite and massive sulphide type deposits. The new VTEM survey, which will cover approximately 473 line kilometres, is excellent for locating conductive anomalies as well as for identifying lateral and vertical variations in resistivity.”

About Blackflace…


High Resolution Airborne Geophysical Survey in Tanzania

Posted by on Sunday, 19 January, 2014

Geological Survey of Tanzania (GST) and Ministry of Energy and Minerals of Tanzania have organized the Workshop “Launching High Resolution Airborne Geophysical Data at Julius Nyerera Convention Center (17 January, 2014, Dar es Salaam, Tanzania). Around 150 delegates have attended the workshop from government and private sectors.

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Geotech Ltd. and Sander Geophysics have finished the airborne magnetic, gravity, electromagnetic (VTEM), radiometric surveys in 31 districts and presented some results of the surveys.

Permanent Secretary (PS) of Ministry of Energy and Minerals Mr.Eliakim Maswi said – the surveys were carried out under the Sustainable Management of Mineral Resources Project, saying the purpose of the survey was to identify potential zones of mineralization. “The main objective of the project is to improve the socioeconomic impacts of mining for Tanzania and Tanzanians and therefore enhance local and foreign investments”, said PS.

GST Chief Executive Officer , Prof. Abdulkarim Mruma said: “geophysical data acquired through the high resolution airborne geophysical surveys allow fast and accurate delineation of mineralised targets and when augmented with geological and geochemical datasets are highly effective in attracting new exploration ventures.” Prof. Mruma noted that the availability of the modern geo-scientific  data will stimulate investments into mineral and other sectors and will improve the effectiveness of exploration programs.

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Photo: A.Prikhodko