### Grab Sampling in Mining Drilling

· Several cars of ore of approximately 1 ton each were chosen from various localities and sorted by hand into different sizes—minus 1 inch, plus 1 minus 3 inches, plus 3 minus 5 inches, plus 5 minus 7 inches, plus 7 minus 10 inches. Each size was weighted and assayed and the average assay determined for each car. It was found that the assay of ...