Salt Lake Tribune | 1915-09-11 | Page 8 | Change Ion Breast at the Alta Tunnel

CHANGE INlREAST AT THE ALTA TUNNEL Bore in 1500 Feet Encounters Encoun-ters Limestone Stained With Manganese. Mining men who have come down from the Silver fork of Big Cottonwood canyon can-yon in the last few days have commented on the altered character of the material appearing on the dump of the Alta Tunnel Tun-nel & Transportation company. It is evident that a change of formation has occurred in the bote, now in about 1600 feet. The waste is a dark brown and deeply stained with managanese. General Manager F. V. Bodfish went to the property tsterday to make an inspection inspec-tion and see what conclusions could be drawn from the change in the rock. The tunnel, it is stated at the local office of the company, has been for the last hundred hun-dred feet under a gulch which comes down the east slope of the main fork. The rock broken there was a recemented hreccla of white and blue lime. The alteration to a homogeneous brown lime may indicate the. proximity of either a dike or a fault fissure. fis-sure. Tile last month's work has brought the breast of the tunnel well Into the country where ore occurrences have been found in the past and the management anticipates frequent and interesting changes during the remaining 37 SO feet of Its drive. Iess than 200 feet ahead on the surface is the apex of a known vein on which an old tunnel was driven 800 feet Into the mountain. F. I,. Schrott, t he locator of the Alta Tunnel claims, recently examined the tunnel, and he states that the ore streak, while only two or three inches wide. Is continuous and Very rich. It will be cut several hundred feet deeper by the main tunnel. This vein is well within the ground owned by the Tunnel company, com-pany, Mr. Schrott has commenced work on-the on-the Lucky Dutchman vein, leased to him a short time ago by the Tunnel company. This vein was penetrated about 450 feet back from the present face of the tunnel. Bunches of first-class ore have been taken out in a distance of fifty feet and Mr. Schrott plans to trace the mineral to its sour,e. which he believes to be In the great Silver fork fault running parallel with the tunnel. The flow of water from the big bore is increasing constantly, the breast being fairly wet, but the siliceous dike, which Is believed to hold back the great volume of water in the Alta divide, has not been reached.