Posts Tagged copper

IP Survey Expands Potential of Schaft Creek Deposit

Posted by AP on Monday, 16 August, 2010

Copper Fox Metals Inc.  provides an update on the results and interpretation of the Quantec Geosciences Ltd. “State of the Art” Quantec Titan-24 DCIP and MT geophysical survey, on the Schaft Creek copper-gold-molybdenum-silver deposit located in Northwest British Columbia.

Highlights:

  • the Induced Polarization/Resistivity (IP) anomalies outlined by the Survey strongly suggest that the Schaft Creek mineral deposit extends a significant distance to the east and at depth beyond the limits of the current diamond drilling,
  • the Survey indicates that the IP anomalies that correspond to the Main, Paramount and Breccia Zones of the Schaft Creek mineral deposit are open to the north and south, and
  • the Induced Polarization anomalies outlined in 2008 have been confirmed by the Survey but these responses are interpreted to represent a geological feature, not mineralization.

Mr. Elmer Stewart, President of Copper Fox stated that “Our primary objective is to complete the feasibility study by the end of 2010. If the IP anomalies are an indication of the size of the Schaft Creek deposit, then the deposit is substantially larger than what has been defined to date. A substantial amount of diamond drilling would be required to define the limits of the deposit. Our 2010 diamond drilling program; although not designed for exploration has been adjusted to test the large IP anomaly identified on Section 6361000 under Mount LaCasse”.

Schaft Creek Deposit:
The Schaft Creek mineral deposit consists of three mineralized zones, being the Main, West Breccia and Paramount (see About Copper Fox for resource estimate of the Schaft Creek deposit).

Quantec Titan-24 DCIP and MT Survey:
Quantec Geosciences Limited (Quantec) was retained to further define two Induced Polarization anomalies located in the area of the proposed mill site in 2008. In order to better interpret any anomalies located by the Survey, the scope of the Survey was extended to include the portions of the Schaft Creek deposit where diamond drilling had been completed. The lithologies, sulphide content and metal grades obtained from the diamond drilling completed on the geophysical Sections were used in the interpretation of the geophysical responses obtained by the Survey.

A comparison of the geophysical response for the Null referenced, DC referenced, Resistivity and MT pseudo-sections shows excellent correlation. To view a geophysical model of the Schaft Creek mineral deposit based on the Null reference chargeability click here. A brief discussion of the IP anomalies defined on each Section is presented below:

Section 6361000:
The survey on this line was completed as a west and east portion due to hazardous terrain conditions. On the west side of the line, the IP anomaly is approximately 1,200 m wide and extends to a depth of 750 m. The western 400 m wide portion of this anomaly corresponds to the Paramount/West Breccia Zone where significant copper-molybdenum-gold-silver mineralization has been defined to an average depth of 400 m below surface. The 800 m wide portion of the IP anomaly located east of the Paramount/West Breccia Zone dips to the east under Mount LaCasse, is open at depth and requires testing by diamond drilling.

The east side of Section 6361000 covers the area of the proposed mill site where the two IP anomalies were located in 2008. The Quantec Survey located the 2008 IP anomalies and based on the diamond drilling information and the strength of the geophysical response, these anomalies are interpreted to represent a geological feature, not sulphide mineralization.

Section 6360600:
The IP anomaly is 1,500 m wide and extends to a depth of at least 750 m below surface. The western 550 m wide portion of this anomaly corresponds to the Paramount/West Breccia Zone where copper-molybdenum-gold-silver mineralization has been drilled to an average depth of 500 m below surface. The 850 m wide portion of this IP anomaly located east of the Paramount/West Breccia Zone dips to the east under Mount LaCasse and requires testing by diamond drilling.

Section 6360200:
The IP anomaly is 1,600 m wide and extends to a depth of 800 m at the center of the anomaly. This anomaly corresponds to the Main and West Breccia Zones where significant copper-molybdenum-gold-silver mineralization and has been intersected by drilling to an average depth of 500 metres below surface. The IP anomaly indicates that copper-molybdenum-gold-silver mineralization extend to a considerable depth below the 500 metre level. A 500 m wide portion of this anomaly located east of the Main Zone requires testing by diamond drilling.

Section 6350800:
Two IP anomalies have been located on this Section. The first anomaly is approximately 250 m wide, has a depth of 300 m and requires testing by diamond drilling. The second IP anomaly is 1,450 m wide; has a depth of approximately 600 m on the western side and a depth of 450 m on the east side. The IP anomaly corresponds to the Main and West Breccia Zones where significant copper-molybdenum-gold-silver mineralization has been drilled to a depth of 250 m. The portion of the IP anomaly below the 250 m level requires testing by diamond drilling.

Section 6350400:
The IP anomaly is 1,500 m wide and has an average thickness of 400 m. The western portion of this anomaly measures 300 m wide by 450 m deep and is located at a depth of 200 m below surface (interpreted to be faulted downward). The remaining 1,200 m wide portion of the anomaly is relatively flat lying and has an average depth of approximately 400 m. This anomaly corresponds to the Main and West Breccia Zones where significant copper-molybdenum-gold-silver mineralization has been drilled to a depth of 250 m below surface. A 250 m wide section on the east side of this anomaly requires testing by diamond drilling. The IP anomaly is open along strike to the south.

Quantec Titan-24 Survey Parameters:
The Quantec Titan-24 DCIP and MT system is a State of the Art geophysical tool used to explore forcopper mineralization. The Survey was completed on five lines surveyed by differential GPS instrumentation over the area of the proposed mill site and further to the west over the Schaft Creek deposit where a substantial amount of diamond drilling had been completed. Survey Sections were completed at 100 m station intervals and 400 metre line spacing. A total of 28.2 kms of DC/IP survey line (plus current extensions) and 22 kms of MT data were collected. Magnetotelluric, Resistivity and Chargeability data were collected at 50 metres stations along each Section. The Titan-24 survey typically images DC resistivity to depths of 500-750 m and the IP typically images to 500-750 m, in sub-vertical tabular geologic settings and up to 50% more for sub-horizontal settings. The interpretation of the data was completed by Quantec utilizing the lithology, estimated sulphide content and analytical results from the diamond drill holes completed on or near the geophysical Sections. The 3D inversion of the DC and IP data was completed using the UBC3D inversion code and is shown as Null referenced and DC referenced chargeability. In several cases, not all of the line could be surveyed due to hazardous terrain conditions. The 14 mRad contour on the UBC smoothed, Null Referenced pseudo-section was used to determine anomalous chargeability.


1970′s IP for the new exploration program

Posted by AP on Sunday, 8 August, 2010

Linear Metals Corporation announces that it has initiated a two-stage exploration program on its LaMorena Copper-Silver Gold project in Coahuilla State, Northern Mexico. The project is located approximately 250 kilometres southeast of Chihuahua, and 40 kilometres north of the Hercules iron mine (skarn), within a known belt of deformed sediments that host Carbonate Replacement Deposits (“CRD”s) such as MAG Silver’s recent Cinco de Mayo discovery, and at least in part, Goldcorp’s Penasquito deposit. Within this overall belt, LaMorena is located at the intersection of prominent regional northeast and northwest trending faults.

Schematic model showing the mineralization style and targets at the La Morena Property.

Previous drilling by Linear Metals and Linear Gold Corp., as well as earlier historic drill holes were focused on outcropping, sub-vertical vein structures and not the potential for deeper, sub-horizontal CRD (“Manto”) and skarn mineralization. Even so, previous drilling intersected significant copper and silver mineralization with intervals of up to 1,245 g/t silver and based on re-examination of drill logs, the better mineralized intervals in drill-holes M-1, M-2, and LM-4, may be from sub-horizontal CRD horizons.

Exploration at LaMorena has commenced this week and will include an initial geophysics program followed by diamond drilling. The exploration program will begin with ground truthing of the near-surface induced polarization (“IP”) chargeability-resistivity targets interpreted from the historic IP survey. This will be followed by “confirmation” re-surveying of most targets, especially the deep targets, using modern, deeper-penetrating IP equipment.

Area of high resistivity at the La Morena Property showing the drill-hole location and a circular topographic depression in the area.

As phase two of the exploration program, approximately 1,500 metres of diamond drilling will test the highest priority IP targets.

Re-interpretation of historic IP survey data (1970′s), recently recovered from the JICA archives, has confirmed that most of the originally interpreted near surface targets remain untested, while also defining six new untested deeper chargeability targets identified at 75 to 175 metres vertical depth.

The historic IP targets are located within the halo of a large, 1.5 kilometres x 3.5 kilometres, ovoid area of re-crystallized and lesser skarn-altered limestones of the Aurora, La Pena and El Cupido formations. The latter two formations are particularly prospective regionally, as they host numerous known CRD deposits such as Providencia-Concepcion Del Oro. The altered area is presumably underlain at depth by an intrusive stock and/or dyke swarm, indicating a potential for skarn and perhaps porphyry-style mineralization.



Goldbrook – the new wide-front offensive on Raglan

Posted by AP on Thursday, 24 June, 2010

Goldbrook Ventures Inc. announces mobilization of men and equipment to its Raglan project, Ungava, Quebec in order to carry out a planned summer field season exploration program.

Belanger Camp will support a large exploration program on the western portion of the Goldbrook properties, and an eastern camp in Kangiqsujuaq (Wakeham Bay) will support activities in the eastern tenures.  Both camps are now operational and receiving field crews. Geological field crews mobilized to these camps during the week of June 21st.

In total five diamond drill rigs are scheduled for up to 25,000 metres during the 2010 summer season and one base-of-till rig will test geochemical anomalies identified from regional data as well as testing coincident Magnetic-EM targets identified from Airborne data.  Geophysical crews to conduct borehole geophysics and surface EM and magnetic surveys will be deployed in early July.

The 2010 exploration program, with a budget of over $17,500,000, includes a goal of 25,000 metres of diamond drilling in conjunction with an extensive program of prospecting, geochemical surveys and ground geophysics over both the east and west extensions of the productive north and south Raglan horizons. This program will follow-up on the positive results of geological, geophysical and remote sensing surveys completed in these areas over the previous years and which helped with discoveries of extensive nickel-copper-PGE sulphides at the Mystery and Timtu zones.

GEOLOGICAL SETTING

The Raglan Project area is underlain by rocks of the Cape Smith (Raglan) Belt that extends for 375 km across the Ungava Peninsula of Nunavik, northern Quebec, Canada. The Aphebian (Paleoproteozoic) Cape Smith Belt and the Thompson Belt, both hosting Ni-Cu-PGE deposits, are part of the Canadian Circum-Superior Belt that separates the Archean Superior and Archean-Proterozoic Churchill geologic provinces of the Canadian Shield.

Komatiite-associated and komatiitic basalt hosted Ni-Cu-PGE deposits occur in Aphebian greenstone belts in various locations around the world including the Cape Smith Belt, Thompson Belt and the Pechenga Belt, Kola Peninsula, Russia.


Renewal of IP data with Fritz Geophysics

Posted by AP on Sunday, 13 June, 2010

Candorado Operating Company Ltd. announces about a thorough review and interpretation of the induced polarization and resistivity geophysical survey, completed in 2007 on their Man-Prime Property. This work is being conducted by Fritz Geophysics of Boulder, Colorado. Final results are pending. The initial interpretation has allowed a much better understanding of the structures and mineralized zones at the Man-Prime Property which will assist in identifying drill targets and in determining orientation of holes in the drill program to begin shortly, once the geophysical interpretation is completed.

Drilling will test geophysical anomalies and copper-gold soil anomalies. Also tested will be of an area of copper mineralization exposed in a trench at the Prime Zone. This trench is part of a much larger copper soil anomaly. Rock chip sampling in 2008 from this trench returned an average of 8550 ppm copper (0.85%) over 20 metres.

Murphy Lake Property
At Murphy Lake CDO is continuing the installation of 80 km of cut lines in preparation for a reconnaissance induced polarization and resistivity geophysical survey to be carried out once the grid is complete. The area of the survey adjoins on the south the Southeast Zone of the Woodjam South Property. On the Woodjam Property similar surveys have been successful in defining mineralized zones.

Man-Prime geophysical survey http://www.candorado.com/i/pdf/Man-Prime-Geophysical-Survey.pdf


The expanding of Geophysical Surveys at Alicia Project in Peru

Posted by AP on Thursday, 27 May, 2010

Strait Gold Corporation  reports that it is expanding geophysical surveys at its Alicia copper- gold project in Peru to determine the extent of an iron-copper skarn zone (Zone 4) where historical trenching returned 20.2 metres along strike grading 1.7% copper and 0.94 grams per tonne (g/t) gold.

The geophysical program was expanded based on observations in the field during a program of mapping and sampling that is currently under way. Potential for further iron-copper skarn mineralization has been identified to the east of Zone 4, including isolated outcrops of iron-copper skarn. Since much of this area lies below cover, a ground magnetic survey will be conducted over the potential target and an induced polarization survey will be extended to the east of Zone 4 prior to selecting drill targets.

“Zone 4 returned the best gold values on the property as well as good copper values, and if it extends to the east, it could increase the tonnage potential at Alicia significantly,” said Strait Gold President Jim Borland. “Geophysical surveys, along with the mapping and sampling programs we have been conducting to date, will allow us to pinpoint drill collars on the most prospective of several targets we have now identified on the property.”

More than three-quarters of samples at Alicia from a recent program conducted by the Company returned values greater than 1% copper (see news release of March 23, 2010). One set of samples from a new zone (the Extension Zone) returned 5.65% copper, 0.95 g/t gold, and 45.25 g/t silver over 6.0 metres and resampling of one trench (Zone 5) returned 2.35% copper, 0.38 g/t gold and 15.14 g/t silver and 0.015% molybdenum over 16.5 metres.

The Alicia project is located within the Andahuaylas-Yauri Belt, which stretches across much of southern Peru. This highly prospective belt hosts numerous porphyry and skarn deposits, including Xstrata’s Las Bambas deposit (1.1 billion tonnes grading 0.77% copper), Antapacay deposit (720 million tonnes grading 0.56% copper) and Tintaya Mine (78 million tonnes of reserves grading approximately 1.1% copper and 0.16 g/t gold).

The Company is conducting a two-phase exploration program at Alicia. Phase 1 consists of community engagement, surface mapping, sampling and geophysical surveys to identify drill targets. Phase 2 will consist of drilling to test for mineralization at depth. Baseline environmental studies and preparation of an inventory of old mine workings on the property are also being conducted as required for issuance of a drilling permit.

The geophysical surveys are being conducted by Fugro Ground Geophysics Pty. Ltd.

A ground magnetic and TEM geophysical survey was performed over the main skarn area. The results of the magnetic survey are very useful in mapping the intrusive body and indicate magnetic anomalies where no intrusive outcrop has been mapped but has been observed in the field by Strait geologists. The TEM survey produced a few wide, poorly defined anomalies at depth, some of which were drill tested with no significant results (AL-03, not assayed).


Magnus Copper-Gold project update

Posted by AP on Tuesday, 25 May, 2010
Alchemy Resources Limited advises that the first round of exploration drilling at its Magnus Copper‐Gold Project in Western Australia has produced promising results which highlight the potential for the area to host repeats of Sandfire Resources Ltd’s neighbouring DeGrussa discovery.
The drilling program at Magnus, which is located 130km north‐east of Meekatharra, comprised seven reverse circulation (RC) holes on seven high priority targets that were identified by a VTEM survey completed in December 2009 (http://explorationgeophysics.info/?p=607). The first seven RC holes were selected across the width of the Magnus project to conduct initial testing of the high priority conductors identified by the VTEM survey and to assist with targeting the drilling of the remaining 26 priority conductor targets.
The initial drilling at Magnus has:
successfully identified extensive stratigraphic horizons within the prospective Narracoota volcanic formation with the potential to host volcanogenic massive sulfide (VMS) deposits. The Narracoota volcanic formation hosts the rich DeGrussa copper‐gold deposit; and
identified minor disseminated sulfides, which in conjunction with geochemical tests being done on bedrock samples, may help to uncover VMS mineralisation.
Down‐hole electromagnetic (DHEM) surveys were carried out in five of the RC drill holes. DHEM surveys are used to identify the source of any conductors that were not intersected in the hole by drilling.
In four of the RC drill holes, which intersected dominantly mafic volcanic and intrusive rocks with minor interflow shales, the source of the VTEM anomaly remains unexplained and will be followed up with further drilling to determine the source of the conductor. In the other three drill holes, intersections of thick intervals of shale are believed to explain the original VTEM anomaly.
Re‐modelling of the VTEM and DHEM data was carried out to better determine the geometry and conductivity of the sources of anomalies. These results, in conjunction with ground electromagnetic surveys, will refine the location of modelled conductors prior to further drill testing.
Forward Program
Ongoing drilling at Magnus will test up to another 26 bedrock conductors identified by the VTEM survey.  Other activities will include targeted ground‐based EM surveys to complement the VTEM survey and identify exploration targets at depth.
“These results are very encouraging and provide Alchemy with more strong evidence that Magnus hosts the geology associated with world‐class VMS deposits such as the DeGrussa discovery,” Alchemy Managing Director Michael Hannington said. “We will now push full‐steam ahead with the next phase of drilling at Magnus to test this enormous exploration potential.”


Video illustration of applied geophysics

Posted by AP on Friday, 7 May, 2010

the video http://www.youtube.com/watch?v=m-QFggDCyCo&feature=fvsr illustrates 3D view of geochemistry and geophysical (IP) data on Eaglehead property where Geochemical and Geophysical anomalies indicate the possible presence of mineralization extending some 10 km on the property. Within this distance drilling has intersected mineralization over some 5.2 km, with possible strike extensions not yet drill tested. Good correlation between geochemical, geophysical and drill results are apparent. Mineralization is intrusive hosted copper-molybdenum with minor values in precious metals occurring in border phases along the southern margin of the Eaglehead pluton, a quartz monzonite to grandodiorite complex of Early Jurassic age some 60 square km in size.


Disco (Discovery) Lake Project under the Crone Geophysics service

Posted by AP on Wednesday, 7 April, 2010

A highly prospective, and underexplored volcanogenic base metal massive sulphide (VMS) belt. The Discovery Lake Project is located in the East Uchi – Petawanga Lake area of Ontario, Canada. The Discovery Lake Project covers several VMS prospects with high potential for a significant VMS discovery containing silver and gold credits. Previous exploration carried out by Falconbridge in 1990 generated drilling targets from airborne and ground electromagnetic and magnetic surveying, geological mapping, trenching and sampling. Noranda Mining and Exploration flew an airborne E.M. survey covering the South Main area in 1995. Pro Minerals has obtained all data of the above which was completed by Falconbridge and Noranda Exploration in the 90’s. These reports indicate that base metal (copper & zinc) values are significant with precious metal mineralization also highly anomalous.

Pro Minerals Inc. has now completed the first phase of exploration on its Disco (Discovery) Lake VMS Project, and initiated Phase 2 ahead of schedule. The Phase 1 program consisted of line cutting, borehole and surface geophysical surveys. All geophysical components of these programs are being carried out by Crone Geophysics & Exploration Ltd. The company will continue with geophysics into the second phase of exploration, and this work will also consist of borehole and surface geophysical surveying. Results from the initial geophysical program are expected shortly and the company will make a news release to report on the results once received. This winter’s atypically warm weather in the Disco Lake region has given Pro the opportunity to move straight into Phase 2, which will consist mainly of prospecting and sampling of existing showings in order to prepare for a follow-up drill program.


Great results with minimum geophysics

Posted by AP on Monday, 29 March, 2010

Fortress Minerals Corp. announces assay results on an additional eight holes from the phase 1 drilling program at its 74-square kilometre Malmyzh license in eastern Russia.

At the Central prospect, Hole AMM-012 intercepted 444.7 metres grading 0.36% copper from 3.8 metres to the bottom of the hole. The Central prospect is constrained only to the northeast by Hole FMCX-2, which intercepted 215 metres grading 0.34% copper. Drill results from the Central prospect show strong westward-increasing vectors in copper grade, increasing gold to copper ratios, and overall increasing grade-thickness along a coincident magnetic anomaly. The western extension of this anomaly will be tested during the second round of drilling.

Ground magnetic map is here: http://www.fortressminerals.com/i/pdf/Malmyzh_Drill_Results.pdf

The phase 1 drill program, which will include approximately 5,200 metres of drilling in 26 holes, will test ten large geophysical and geochemical targets. Determination of hole locations for the first-pass drilling program was based almost exclusively on soil geochemistry and magnetic anomalies due to the extensive soil and vegetative cover that characterizes the Malmyzh license. The phase 2 drill program, which is scheduled to commence in November 2010, will concentrate on delineation drilling of higher-priority mineralized targets identified in phase 1 and focused drilling in the priority prospects to identify higher-grade copper-gold feeder zones.

Malmyzh:

  • At least 10 strong targets within a 40 km2 area
  • Copper/gold porphyry mineralization style similar to Oyu Tolgoi in Mongolia
  • 25 year exploration and mining license

The Malmyzh Copper-Gold Project is located 215 kilometres northeast of the City of Khabarovsk near well developed infrastructure, including high voltage power lines, the Amur River (a major shipping route in the Russian Far East) and all season roads that connect the project to the regional capital of Khabarovsk City and the seaport City of Nikolaevsk at the northern end of the Sea of Japan. The Malmyzh prospect is held under a 20-year Exploration and Mining License.


Silver Swan drilling program 2010 after the geophysical survey

Posted by AP on Sunday, 28 March, 2010

Silver Swan (Australia) commenced its 2010 drilling program. The drilling will be focused on further exploring target zones in the Quinns and Yagahong project areas. Subordinate drilling is also planned for the remaining three project areas in the Company’s current portfolio of assets. The drilling program is expected to be executed in staggered phases across projects to allow time for the cumulative assessment of results.

Drilling on the project areas in the third and fourth quarter of fiscal 2010 will comprise:
1. Diamond and RC drilling to further develop the Austin (Quinns project area) mineralisation, testing depth extensions for underground Cu-Zn-Ag-Au potential.
2. Diamond and RC drilling into an EM conductor in the twin aeromagnetic anomaly immediately north of Austin (now named Robert) for Cu-Zn-Ag-Au mineralisation.
3. Drilling several Cu-Zn-Au-Ag bulls-eye targets in the greater Quinns project area related to prominent electromagnetic and geochemical anomalies.
4. Diamond and reverse circulation drilling at Copper Hills and Lady Alma in the Yagahong project area. The company will test known Cu-Au mineralisation associated with sheared gabbro for its potential to develop into a Cu-Au resource with up to 3km of strike potential for this zone.
5. Diamond and RC drilling into several prominent VTEM conductors west of the main Copper Hills zone, at and near Lady Alma. The target is conductive copper and related mineralisation.
6. A fence of reverse circulation drilling across two wide ~NW oriented shear zones and across large ~NE oriented brittle faults (that are a major control regionally for hosting copper and gold mineralisation) in the Lady Alma area.