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I came across an old operation on government property that appears open to claim (I will verify before removing any minerals).
Background: I know nearly nothing about cyanide leach.
Here are a few details that I found in mining reports and other documents.
1980's - 1.5 Million tons of gold and silver bearing ore removed from open pit for heap leach operation.
Mine report mentions milling to 1/2" minus, gravity seperation, then leach with carbon column collection. No reports of refractory gold or sulphides.
Mining report also mentions start-up issues, operator errors, and lower than expected recovery.
Assays show gold range 1.5 - 0.01oz/t. Average 0.1 oz/t.
150,000 oz reserve (low estimate)
30,000 oz recovered. I'm not sure how much silver was recovered or if 30,000 was the combined total.
Seems to me that there is still some gold to be recovered. Would a heap leach be safe to sample after 25 years?
I assume the cyanide has dried and decomposed. Would the gold even be gold anymore? Or some sort of unidentifiable powder salt?