Ann: Suspension from Quotation, page-69

a tldr:
The article explains cut-off grades in mining, which determine the economically mineable portion of a mineral deposit. It is influenced by factors such as mining costs, commodity prices, and the depth of the deposit. A lower cut-off grade allows more intercepts to be included in a resource model, increasing the size of the resource. Changes in commodity prices can adjust the cut-off grade and impact the resource’s economic viability.