| Show A PROBLEM IN GEOLOGY times halley hailey idaho geological history is being made just now at a rapid pace in galena gulch and surprises have been frequent and sensational john boyle of boyle mountain fame said many years ago that the minnie moore vein naly dipped the reverse of its present dip and had been pushed over at the top by a diorite overflow the 1200 foot level of the minnie shows the diorite standing almost straight up and now the crosscut tunnel of the alturas alburas company has penetrated the virginia an extension of the minnie and it is found on a reverse dip from what it was only feet vertical overhead where it was dipping southwest under the contact at twenty three degrees the vein is a large strong fissure filled with calcite and the usual ledge matter found in the minnie it has been crossed for twenty feet in the past three days and the hanging wall has not yet been reached there is a heavy flow of water in the face which is considered a good indication the alturas alburas management had not t expected of the to get ore at the crossing of ofine the vein but to drift east under the rake relief ore shoot which must pass into vir ground from to feet from the ginia inia present resent heading here the fine ore body recently opened on the relief should be found pitching to the southwest it was very fortunate that the alturas alburas management stopped sinking and began to crosscut as the deeper the shaft went the farther away would have been the vein and it never would have been reached while this sensational disclosure was being made on the virginia ground the drift on the level of the relief went square into the diorite which is identical in dip with the diorite dipping northeast in the virginia crosscut near the shaft the relief heading was at once turned from northwest to northeast and the contact will be traced as far as possible to find where the vein resumes its normal course it looks very much as though this was the line of a huge block fault and that the relief will have to drive northeasterly the same distance as the virginia feet to get the vein again on its regular course the reverse conditions prevailing in both the lower and upper portions of galena gulch are sure to give rise to much discussion and to attract the close interest of both mining men and geologists in this section who will probably find here a solution of the faulting that has so greatly puzzled our mine owners during the past twenty years |
