The first four holes on the Cuatro Hermanos copper-molybdenum project in Sonora state, Mexico, have intersected significant molybdenum mineralization along with low-grade copper.
Virgin Metals (VGM-V), which is doing 6,000 metres of reverse-circulation drilling on the prospect, put four holes on the Sulphate Zone prospect, near the contact between a volcanic complex and a quartz-diorite porphyry intrusion. The four holes tested an area about 500 by 350 metres in size.
Three vertical holes intersected 168 metres grading 0.032% molybdenum and 0.2% copper, 122 metres grading 0.042% molybdenum and 0.26% copper, and 131 metres of 0.11% molybdenum and 0.2% copper. An inclined hole graded 0.114% molybdenum and 0.29% copper over a 56.4-metre drilled length, equivalent to a true thickness of 45.5 metres. Assay results are pending on a fifth hole in the area.
One of the holes twinned a hole by an earlier operator; that hole, in 1969, cut 145 metres grading 0.18% copper and 0.034% molybdenum.
Most of the mineralization occurs as disseminations and veinlets in the diorite host rock, which shows quartz-sericite-pyrite alteration. In the inclined hole, most of the mineralization is in silicified quartz-diorite dykes.
Three more holes are complete on the Main Zone, about 700 metres south of the Sulphate Zone, and drill cuttings are out at the laboratory. Another hole on the Main Zone is in progress and an induced polarization and resistivity survey is planned.
The prospect has seen exploration over a 35-year period, under several different operators. Mineralization is known in the Sulphate and Main zones, both in an area where the diorite intrudes an earlier, mainly felsic, volcanic complex, and in the Cactus zone to the northeast, where a series of small stocks of diorite and diorite breccia, off the main intrusion, cut through the volcanics.
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