A third phase of reverse-circulation (RC) drilling is to begin at the Alamo Dorado silver-gold project of
Situated in Mexico’s Sonora state, the property hosts an independently measured resource of 74.8 million tonnes grading 41 grams silver and 0.16 gram gold per tonne. Drilling will test for mineralization downdip and northwest of a potential open pit within the resource, as well as a geochemical anomaly on the slope of an adjacent ridge to the southeast. The anomaly is 700 metres long and 100 metres wide.
Corner Bay is determining the best crush size and solution flow rates by leaching composite samples of four large-diameter core holes. Each of the holes were drilled at a depth of between 275 and 290 metres, in the middle of the deposit. These holes were drilled between earlier RC holes. Results include:
– 230 metres of 110.5 grams silver and 0.23 gram gold in hole 1;
– 203 metres of 74 grams silver and 0.25 gram gold in hole 2;
– 184 metres of 44 grams silver and 0.18 gram gold in hole 3; and
– 168 metres of 74 grams silver 0.2 gram gold in hole 4.
These latest results are comparable to those of the previous RC holes. Moreover, duplicate samples sent to two different labs proved consistent.
The upcoming RC program will consist of 10,000 metres, with geological mapping carried out at the same time.
Mineralization at Alamo Dorado is structurally controlled along the eastern contact of a granodiorite intrusive. The silver is associated with chlorargyrite, a soluble silver choride mineral known to form in secondary enrichment zones above silver veins subjected to intense weathering.
The zone strikes north-northwest and dips to the west. Topographically, it outcrops on the top of a large hill and gently dips along its slope, making it amenable to open-pit mining.
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