A traditional method of verifying mineralization grades in mining is to drill twinned holes, i.e., the drilling of a new hole, or 'twin,' next to an earlier drillhole. Ge use data collected at both holes to compare and validate the mineralization grades. What is the purpose of drilling twinned holes in mining?
1) To compare and validate the mineralization grades
2) To increase the accuracy of mineralization grade estimates
3) To reduce the cost of drilling
4) To explore new mineralization areas