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Report excerpt: 'Can La Cigarra and Promontorio be mined profitably
According to an article by The Independent Speculator, a rule of thumb for classifying silver grades in ore deposits is shown in the below table and to help illustrate why that classification is relevant, the rock value corresponding to the silver grade ranges has also been included. The rock value is useful because it allows us to approximate if the grade is high enough to cover the cost of potential extraction given the metal contained.
With an average grade of the indicated resource of just over 100 g/t for La Cigarra and just under 80 g/t for Promontorio, both deposits fall into the middle range of the average grade category. That tells us that given the cost estimates and current metals prices, the silver at both deposits could be mined profitably in theory. However, there remains considerable uncertainty around key metrics like metallurgy, stripping ratio and size of the operation (CAPEX), all of which will have direct impacts on the economics of mining projects.'
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