. The sampling and estimation of ore in a mine . Fig. 9ShowinH Rock Structure ] Ore WM Good Ore. —64— (; AND ESIIMAIION OK ORE IN A MINE These data are perplexing and indicate an alternationof values which renders any estimate very , however, the geological structure is investigated,there is found to be a relation, between values and struc-ture, which illuminates the entire problem. In Fig. 11there is given a section, on the plane of the vein, whichexhibits the position of the series of layers throughwhich the vein cuts. This helps to explain the resultsshown in Fig. 9. T
. The sampling and estimation of ore in a mine . Fig. 9ShowinH Rock Structure ] Ore WM Good Ore. —64— (; AND ESIIMAIION OK ORE IN A MINE These data are perplexing and indicate an alternationof values which renders any estimate very , however, the geological structure is investigated,there is found to be a relation, between values and struc-ture, which illuminates the entire problem. In Fig. 11there is given a section, on the plane of the vein, whichexhibits the position of the series of layers throughwhich the vein cuts. This helps to explain the resultsshown in Fig. 9. The zones of enrichment penetratedby adits No. i and No. 4 coincide with two layers ofclose-textured tufif, or fine-grained breccia, laid downduring the intermittent violence of volcanic intermediate, overlying, and imderlying beds ofbreccia are coarse, and, for some reason which does notconcern the present inquiry, they are less favorable toore-deposition than the occasional layers of tuff. In this instance the evidence was very clear; in othermines situated in the same regi
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectores, bookyear1907
