506 MINIKG INDUSTEY. 



been located beyond the assumed point of intersection and some mining work 

 has been done upon them. It is in the little ravine just referred to that the 

 first discovery of the vein was made. 



The most developed portion of the lode begins some 600 or 700 feet 

 northeast of the probable junction with the Mammoth and continues thence 

 in a northeasterly direction some 1,500 or 2,000 feet, divided among and 

 worked by some half-dozen or more companies. Its general course for this 

 distance is 30° east of magnetic north; or, allowing 15° for variation of the 

 needle, is north 45° east, true, or northeast and southwest. Its course in 

 this direction may be traced on the surface down the northern slope of 

 Gregory Hill, across the Gregory Gulch, and over the hill which divides 

 Gregory from Chase Gulch; and along this part of the vein, from the bottom 

 of Gregory Gulch, where is located the mine of the Smith and Parmelee 

 Company, to the top of Gregory Hill, the surface is covered with the shaft- 

 houses, hoisting and pumping works, mills and waste-dumps, of the several 

 companies engaged in mining on the lode. The dip of the vein is nearly ver- 

 tical, though sometimes inclined either to the northwest or southeast. In the 

 Consolidated Gregory mine the shafts are sunk vertically and are generally 

 within the walls of the vein ; further to the northeast, on the ground of the 

 Black Hawk and the Briggs mines, the pitch is southeast, though not deviat- 

 ing far from the vertical ; the inclination of the pump-rod in the former show- 

 ing a dip of 83° or 84°; while still further northeast, in the mine of the 

 Smith and Parmelee, where the vein is divided into two branches, one of 

 which is known as the Gregory and the other as the Briggs, the former dips 

 steeply to the northwest while the latter dips to the southeast. 



The relation of the so-called Briggs vein to the Gregory has been the 

 subject of much discussion and some litigation, some claiming that the two 

 are distinct and independent veins ; others, that there is but one vein, which 

 is divided into two parts by an intervening "horse" of ground. The probabili- 

 ties seem to the writer to be in favor of the latter view, though until the 

 developments of each branch are sufficient to determine the limits of the 

 "horse," or to show beyond a doubt that the intervening ground between 

 the two brandies is actually only an isolated and inclosed fragment, and not 

 a permanent and continuous part of the country-rock, there will be some 



