Posts Tagged SJ Geophysics

Completion of Geophysical Survey at King Solomon Dome Property (Yukon)

Posted by on Saturday, 30 June, 2012

Kestrel Gold Inc.  announces the completion of a geophysical survey at Kestrel’s King Solomon Dome Property south of Dawson City, in the Yukon Territory (“KSD“).

The Survey is intended to map the geophysical properties of resistivity and chargeability of the subsurface down to a depth of 500 metres. SJ Geophysics Ltd. of Delta, British Columbia using their new Volterra-3DIP system in conjunction with a magnetometer survey over a grid approximately 1.6 km by 1.6 km, has been focusing on the area encompassing the Sheba and Mitchell workings which lie within a large gold geochemical soil anomaly. This second phase of deeper geophysical work is envisaged to give a much clearer (3D) picture of the morphology of structures, contrasting lithologies and additional potential drill targets at greater depths. The Survey follows on from the first phase of geophysical work conducted in 2011 which was successful in outlining a large chargeable IP anomaly centred in the area around the Sheba showing and trending towards the Mitchell Shaft to the north over a distance of approximately 1.2 km open along strike and extending to depth.

William Taylor, the Vice President Exploration of Kestrel comments: “We know from work done to date the importance of regional scale NNW trending D4 structures at KSD in relation to Klondike gold mineralization. This survey will help us better understand the other factors that have concentrated the gold and other path finder elements in this particular area where the signatures are so relatively high.”

A number of drill targets have already been outlined at KSD and the results of the Survey are anticipated to be received in advance of the Corporation’s planned 2012 diamond drill program.

King Solomon Dome is a 4050 foot peak in the Yukon Territory of Canada.  It is believed to be the source of the gold fields that sparked the Klondike Gold Rush in the early 1900′s (link to Yukon Gold Mining – Klondike).  Kestrel has an option to earn 100% interest in four individual properties in the King Solomon Dome. The option will require Kestrel to make staged payments totaling $920k over a period of 4 years, issue 150k shares and fund exploration expenses of up to $100k.

Geology

Previous soil sampling within the project area claims had encountered 3 main anomalous zones, each at least 1.0km in length and varying from 25 metres to 400 metres in width, with soil geochemical values of up to 965 ppb Au associated with occasional highly anomalous arsenic, antimony and lead. This metal signature is common to White Gold area mineralized zones such as the Golden Saddle and Arc deposits held by Kinross Gold (formerly Underworld Resources). Recent trenching of these anomalies has encountered mineralization including narrow high-grade zones often containing visible gold with grades ranging up to 14,700 ppb (14.7g/t) Au over 1.9m, 8100 ppb Au over 1.9m and 40,670 ppb Au (40.7 g/t) over 0.7m; as well as broad intervals with grades such as 1622 ppb (1.6 g/t) Au over 8.4m and 2242 ppb (2.2 g/t) Au over 18.2m.


IP Survey Results in Mexico

Posted by on Monday, 23 May, 2011

Corex Gold Corp. announces that it has received positive results from the most recent deep 3D IP survey conducted by SJ Geophysics Ltd. on its 100% owned Santana Property in Sonora State, Mexico. Target: A multimillion-ounce epithermal gold deposit amenable to open pit mining and heap leaching. This latest survey was configured with wider line spacing and dipole lengths in order to increase the depth of investigation. It included 13 E-W lines, each 3,200m in length and spaced 200m apart. These parameters effectively increased the depth of investigation to 400 – 500m.

Highlights:

  • Identified new exploration targets
  • Confirmed & expanded several know mineralized trends
  • Shown continuity at depth between previous drilled zones
  • Evidence that Santana is part of a large emerging porphyry district

Overview of 3D IP Survey:

The new zones confirmed and identified by the deep IP survey are: Benjamin North-East, Benjamin South-West, Benjamin North, Nicho South-East.

Benjamin North-East: A small chargeability anomaly detected on the 2010 IP survey, some 400 meters northeast of the Benjamin zone was confirmed by the 2011 survey. The zone appears to be a northeasterly elongated and nearly horizontal layer, buried approximately 150m below the surface. This zone is bounded to the north by the NE trending Benjamin Fault zone and to the east and west by NW striking faults, interpreted from the resistivity and magnetic data.

Benjamin South-West: A small chargeability anomaly detected on the 2010 IP survey, some 300 meters south-west of the Benjamin zone was confirmed by the 2011 survey. The combined data reveals a small plug like body buried 150 meters below the surface. This anomaly exhibits similar characteristics to those observed at Benjamin.

Benjamin North: Indications of a northwesterly dipping chargeability layer, extending from just below the Benjamin Zone to the northwest were evident in the 2010 survey. The 2011 survey has confirmed this response and shows it to be associated with a large, deep body.

Nicho South-East: This area includes three sub zones: Divisadero, Santa Lucia and El Nicho. The 2010 survey mapped localized high chargeability zones across the area that seemed to be connected depth. The 2011 survey confirmed this hypothesis, suggesting the bottom of the chargeability zone mostly extends to about 180m depth. It also detected a deep, easterly plunging high chargeability root beneath the Nicho South-East zone at the western edge of the area.

Structures:

The 2011 survey confirmed the patterns of northeast and northwest trending structures (faults) revealed by the 2010 survey. It also shows the dominance of several NE striking structures at depths of 300 – 500m. One of these interpreted fault zones appears to connect the Ubaldo zone (to the southwest) to the Nicho and Marmero zones to the northeast.

This deeper survey confirms the presence of a large, deeply buried body located along the eastern and northeastern edges of the study area. This body is outlined by elevated chargeability and magnetic susceptibility values. Corex believes this represents a large buried intrusion.

The geophysical surveys and drilling to date indentified intrusive bodies associated with volcanic domes which define a seven kilometer corridor in the Northeast direction and a four kilometer corridor in the Northwest direction (see attached map and section). In conclusion, there is evidence that the Santana Project is part of large Porphyry Belt.


3D IP program in Mexico after the first positive drill results

Posted by on Sunday, 23 January, 2011

First Mexican Gold Corp.  provides the results from the first three holes of the planned 10 diamond drill holes for +/- 1250 metre drill program on the corporations property package in the Guadalupe – Santa Anna area of Sonora State, Mexico. The Company’s property package (known as Guadalupe Property, 1566 hectares) is contiguous to Corex Gold Corp. Santana Property where consistently good exploration results have been demonstrated.

The initial three holes, all from the Karen zone, returned very good grade intersections from surface or near surface occurrences over potential mineable widths as highlighted in Hole HDH 11-05 where beginning at surface, drilling intersected 33.4 meters averaging 4.27 g/t Gold, 395 g/t Silver, and 1.24% Copper.

Results

Holes HDH 11-04 and HDH 11-05 were collared at the same location with hole four having an azimuth of 70 degrees and a dip of -66 degrees. Hole 5 had the same azimuth and a dip of -50 degrees. Both holes were drilled to approximately 100 metres and were mineralized throughout. These Holes were not believed to be perpendicular to the mineralization on the Karen Zone.

Hole HDH 11-06 was collared 45 metres to the NW and 23 metres higher in elevation with an azimuth of 140 degrees and a dip of 54 degrees effectively cross cutting holes 4 & 5 on an 85 degree angle.

“We are very pleased with the results of this initial drilling of our 2011 drill program at the Karen zone of the Guadalupe property and look forward to further drill results,” said Jim Voisin, President and Chief Executive Officer of First Mexican. Mr. Voisin adds: “These initial holes for 2011 have confirmed the higher grade potential of this project and provide a good start to our 2011 program which has just barely begun.”

Having now completed 5 diamond drill holes to date on the Karen zone, with 2 still to report, the company will now take the time to model and interpret these very positive results to date before advancing the next phase of drilling on this zone. The next step planned for the Karen zone is an IP (Induced Polarization) survey program.

The drill rig is presently being moved approximately one kilometre west to Hilda 38 and the Diana zone where we expect to drill two or three holes into what we consider a lower grade higher tonnage mineralized target. The final holes of this program are intended to be drilled on the Bailey zone, a recently acquired property with a very interesting display of azurite laden rock, where assays of initial rock samples from the adit of the historic copper mine has confirmed the significance of this high potential drill target.

SJ Geophysics Ltd. of Delta B.C. has been contracted to mobilize an IP (Induced Polarization) crew to the Guadalupe project as quickly as possible to begin a 25 kilometre program. This 3D IP program is designed to enhance the drill targeting over future multiple target rich areas and provide follow-up data to assist in the next phase of drilling the initial discoveries within our continually expanding property package.

In addition to completion of the present drill program, construction of the new camp and the IP program, the company will continue to focus on extensive soil and rock chip sampling/mapping across the Guadalupe property. Precious metal results to date have been very encouraging and support the company’s view of the positive exploration potential of this prospective gold/silver/copper bearing area.


IP survey on silver property in Nevada

Posted by on Monday, 8 November, 2010

La Quinta Resources Corporation announces that it has engaged SJ Geophsiycs of Delta, BC to conduct an electrical geophysical survey at its BlackJack silver property located in Elko County, Nevada. The survey will consist of approximately 22,600 lineal feet (7 km) using pole-dipole time domain induced polarization technique. Historic data shows that reconnaissance sampling of outcropping veins and underground workings conducted in 2007 returned significant lead, silver, zinc, gold and copper values associated with polymetallic sulfides hosted in veins within Ordovician limestones. The survey lines are situated over and flanking the historic workings on the property. The IP technique is anticipated to be useful for delineating hidden veins and replacement style massive sulfide lead-silver mineralization in unexplored regions below and distal to the historic underground workings.

The property, containing sediment-hosted high-grade lead-silver-zinc veins approximately 50 air-miles north of Elko and 12 miles west – northwest of the Jerrit Canyon Mine. The property consists of five lode mining claims (~100 ac). A total of approximately 1,200 ft of drifts and stopes have been developed along one level only. The old airtram and rails are still in the main drift. No detailed sampling has been done on the property in modern times.

The host rock is brecciated dolomitic limestone of the Ordovician Porter Peak carbonate sequence. A porphyritic dacite dike intersected in the underground workings is approximately 20 ft wide and has been completely argillized where exposed. Mineralization consists of a mass of carbonate-quartz veins exhibiting both coarse stockwork and sheeted characteristics with oxidized galena and sphalerite. In reconnaissance level sampling, metal values ranged from 3 – 90 oz/ton silver, 0.001 – 0.068 oz/ton gold and 0.8 – 37 % lead along more than 3,500 ft aggregate strike at surface and in underground workings. The veins individually range from 1ft – 20ft wide. These veins also contain anomalous amounts of bismuth, antimony, cadmium, copper and tungsten in addition to the silver, lead, zinc and gold.


3D IP Survey for Mt Penck Papua New Guinea

Posted by on Friday, 10 September, 2010

Vangold Resources Ltd.  reports it has completed a three dimensional induced polarisation (3D-IP) geophysical survey conducted at Mt Penck EL 1322 (area 102 sq km) located on New Britain Island and the Igwageta Prospect, EL 1324 – Fergusson (area 115 sq km), Milne Bay Province, Papua New Guinea. The 3D-IP preliminary reports at Mt Penck define five geophysical targets which are interpreted to related sulphides including pyrite, chalcopyrite and arsenopyrite. An association of arsenopyrite with gold occurs in drillholes at Kavola. The 3D-IP survey at the Igwageta Prospect (Fergusson) EL 1324 defines the presence of excellent new targets for bulldozer trenching and drilling, shows significant mineralisation depth potential, and has confirmed the existing gold mineralisation and structural interpretation.

A seven week exploration program at the Igwageta Prospect, which commenced in April and was completed in late May 2010, covered an area of approximately 1.0 km2 (1.2 x 0.8 km). The area of interest was cut with access/soil sampling lines at nominal 100m spacing. A three dimensional induced polarisation (3D-IP) chargeability and resistivity survey was completed over the gridded area.

To view Figure 1, please click here: http://media3.marketwire.com/docs/van0909m.pdf.

The 3D-IP survey was designed to test for geophysical responses related to the Igwageta Prospect and to locate additional, potentially gold and silver epithermal mineralised trends. The modelled resistivity results are being used as a diagnostic tool to interpret silica flooding targets, which management believes may be related to gold mineralisation. The chargeability defines anomalies related to sulphide mineralisation, and is potentially associated with gold veining and gold mineralisation.

A total of nine targets have been identified that are either associated with gold mineralisation, or are potentially related to additional gold bearing quartz reefs. The Igwageta gold vein assemblage (IG1) occurs as an elongated 430m long zone of slightly anomalous resistivity (300 to 400 ohm.m) trending west-northwest. The eastern section of this vein assemblage is interpreted to be faulted to the north and re-occur as an anomaly (IG7).

Within the gold anomalous areas of Igwageta at IG 1, 3, 4, 5 & 6, higher chargeability values occur over an area of 400m by 250m and extend to more than 200 meters in depth. These zones of higher chargeability potentially reflect gold mineralisation associated with arsenopyrite sulphides.

The Igwageta vein systems (IG 1, 2 and 3) and associated ‘historic’ gold in soil geochemistry, correlate with a linear zone of magnetite alteration (destruction due to hydrothermal fluid flow, that is, it is a gold mineralising environment) in the airborne geophysical data. A similar magnetic low lineament to the Igwageta vein that has not been investigated is located about 600m to the northeast. These areas occur in a broader (3 1/2 sq. km) circular zone of alteration, and are evident as anomalously low airborne magnetic and radioelement signatures.

The Igwageta vein system, the magnetic lineament to the northeast, and the surrounding zone of magnetite alteration, are proposed as locations for a future expanded soil sampling and 3DIP geophysics survey. These surveys are recommended to cover 1.4 km by 1.6 km and may delineate further drill targets by defining anomalies related to concentrations of gold vein and gold sulphide related mineralisation. As discussed above, the resistivity component of the survey is expected to help delineate areas of silica flooding that may be related to gold mineralisation. Gold in trench samples also correlate with arsenic, which may be detected as sulphide related anomalies in the IP component.

For part of the survey, five pits were dug and sampled and visible gold were observed from weathered C-horizon rock collected from the base of the pits that was panned. In addition, a zone of soil and drill hole gold anomalism shows visible gold in the altered rhyolitic volcanics. Several occurrences were noted by macroscopic evaluation at the locality, but the occurrences are too fine grained for standard photography.

Within the next ten days, Vangold expects to receive comprehensive reports from SJ Geophysics with processed results on the geophysical surveys conducted on each of the Company’s three gold properties (Mt. Penck, Fergusson and Allemata). Peter Swiridiuk, a consulting geologist and member of the Australian Institute of Geoscientists and Australian Society of Exploration Geophysicists, will be interpreting the results.

Vangold also announces that it has received preliminary results from it 95% owned prospect on New Britain Island, Mt Penck. The 3D-IP which has recently been completed indicates the presence of an IP anomaly located in the area of Kavola South. This geophysical anomaly expands at depth. The Company expects elevations and sections of the 3D IP work conducted at Mt Penck within a week. At which time it will issue a comprehensive Press Release.

Vangold’s three gold properties (Mt. Penck, Fergusson and Allemata) are located in Papua New Guinea along the “Pacific Rim of Fire”, the active circum-Pacific volcanic belt that is host to large copper-gold porphyry systems (Grasberg, Ok Tedi, Panguna and Frieda River) and to a number of world class epithermal gold deposits including Porgera and Lihir.


All That Glitters: Geophysical Exploration for Precious Metals

Posted by on Sunday, 7 March, 2010

it was a theme of Canadian Exploration Geophysical Society’s a timely and informative full-day symposium which took place yesterday in Toronto and timed to PDAC-2010. A roster of noted industry experts presented papers focussing on exploration and extraction of gold, silver, and platinum group metals. The symposium included an introductory overview of key geological aspects of important types of Au, Ag, and PGM deposits, cover particular geophysical surveys and applications, case studies, and look at promising future technologies.

The companies which made the presentations: Barrik Gold Exploration; SRK Consulting; MB Geosolutions; Condor Consulting; Fugro Airborne; Aeroquest Surveys with Teck REsources; Geotech Ltd.; Zonge Egineering with Terra Res.; Quantec Geoscience; JVX Ltd.; Abitibi Geophysics; SJ Geophysics Ltd.; Southern Geoscience Consultants; Levon Res with Coro Minera and Fritz Geophysics; Geophysical Algorithms; RMIT; Geoscience BC; GSC; University of Quebec; Ontario Geological Survey with PGW.

http://www.kegsonline.org/?dir=event&sub=&id=8002