The Cortez area is undergoing a flurry of exploration and drilling activity spurred by drilling successes at the Cortez Hills joint venture.
The Cortez joint venture, held 60% by by
The Cortez mine lies along the Battle Mountain trend in north-central Nevada, 60 miles southwest of Elko. Placer recently acknowledged market rumours of a discovery at Cortez Hills in the range of 1.5 oz. gold over more than 400 ft. but tried to tone down its enthusiasm. The company said the results are preliminary and that more work is needed before it can judge the impact of the grades on resource figures.
So far, 44 of a planned 100-200 holes have been drilled at the Cortez Hills area, some of which are testing the area between the Pediment and Cortez Hills discoveries (reported in 1998 and 2002, respectively).
Gold reserves at the Cortez joint-venture properties include 5.2 million oz. at Cortez Hills contained in 41.2 million tons grading 0.127 oz. gold per ton. There are also 3.9 million tons grading 0.138 oz., or 544,000 oz. gold, in the measured and indicated resource categories, and another 8.1 million tons at 0.125 oz., or 1 million oz., in the inferred category.
— White Knight —
The company’s properties include Fye Canyon, Pat Canyon and McCluskey, where magnetotelluric and gravity surveys are planned.
— Miranda’s properties —
The Cortez mine sits in the Gold Acres window, and the Cortez window hosts Cortez Hills. Miranda has properties that cover the next three windows south of the Gold Acres and Cortez windows: the company’s Red Hills property covers a portion of the JD window, its Coal Canyon property overlies the Windmill window, and at Red Canyon, favourable lower plate rocks are exposed in the Red Canyon window.
— Trend project — Last year,
NDT optioned the property to
— Coral Gold —
A 10-hole program of reverse-circulation (RC) drilling in May 2004 attempted to expand the known mineral resources in the 39A and Gold Pan zones. Hole 8, drilled as a stepout hole on the eastern side of the 39A zone, intersected 80 ft. grading 0.111 oz. gold from a depth of 630 ft., including 30 ft. grading 0.229 oz. gold.
The 39A zone contains a resource of 4.7 million tons grading 0.077 oz. gold per ton.
— Fire Creek —
The company recently completed 8,900 ft. of RC drilling and 7,600 ft. of core drilling in 16 holes, which began in March. Eleven of these holes tested the Main zone, three tested the South target, and two tested the North target.
Highlights include a 10-ft. intersection of 0.87 oz. gold and 0.63 oz. silver drilled in the Main zone at a depth of 970 ft. This carried a 5-ft. interval grading 1.34 oz. gold and 0.9 oz. silver per ton.
Hole 4-02, also drilled at the Main zone, returned a high of 1.54 oz. gold and 1.43 oz. silver over 5 ft. starting at a depth of 905 ft. At the South target, hole 4-11 returned up to 0.41 oz. gold and 0.19 oz. silver over 10 ft. starting at a 720 ft. down-hole.
The property has a resource of 19.7 million tons containing 600,000 oz. gold.
— Tonkin Springs —
With a positive feasibility study in hand, the companies are planning a 5-year, 100,000-oz.-per-year operation with average cash costs estimated at US$238 per oz. Bactech plans to apply its patented bioleaching technology to recover gold from Tonkin Springs.
The property contains minable reserves of 10.6 million tons grading 0.061 oz. gold, or 646,000 oz.
Measured and indicated resources total 29.6 million tons grading 0.043 oz. gold per ton (1.27 million oz.) at a 0.012-oz.-per-ton cutoff. Inferred resources amount to 3.4 million tons grading 0.044 oz. gold (152,000 oz.).
Infill drilling is under way at existing pits, and surface work and subsequent drilling for potential near-surface deposits are planned. Five targets have been identified in the southern half of the property, and soil and chip sampling are planned. Some work is also planned for the northern section of the property.
— Nevada Pacific — In the Cortez trend,
Keystone is underlain by limestone, shale, and sandstone, which have been intruded by a granodiorite stock. Base and precious metals mineralization occurs in skarn zones near the northern edge of the intrusive. The Keystone mine exploited stratabound base and precious metals mineralization in the 1940s and 1960s, with 114 tons of ore yielding 19,800 lbs. lead, 17,900 lbs. zinc, 1,400 lbs. copper, and 417 oz. silver.
This spring an induced-polarization survey covering a 5,000-by-3,280-ft. area was centred on the old Keystone base metal workings, targeting massive-sulphide replacement bodies along the intrusive contact. Four discrete anomalies were found, one of which coincides with high-grade massive sulphide float on surface.
About 5,000 ft. of RC drilling and 3,000 ft. of core drilling are planned for the property once access roads and drill sites are completed.
— Mill Creek —
Drilling has been under way since April. Two holes were completed as part of the 13,000-ft. program, and a gravity survey is providing further targets.
— Golden trend —
trend.
Japanese gold-investment company Jipangu recently acquired a 50% option on J-Pacific’s properties. Drilling is planned for Golden Trend; soil sampling, for HC.
— Montezuma —
Exploration includes geologic mapping, soil and rock geochemistry, magnetic and gravity geophysical surveys, and two rotary drill holes. The surveys indicate that this part of the valley is a saddle-shaped basin with a northwest-trending bedrock horst forming a bridge between deeper parts of the basin to the west and east. This horst block is prospective for Cortez and Pipeline-type deposits.
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