OCR Text |
Show Late os Monday the Sutro tunnel mado CDnoection with the Corns tocb lode, opening into the 1650 foot level of tbe Savage. The occasion was made one of jollification. From the Virginia city Chronicle e obtain a candeosed hiitory of the tunnel: Ground wai broken for the Suiro tunnel on the l'Jth of October, 1S69. The work has thoretoro required tight years, e: gat months and ten utyt to complete. The prjre;3 was very slow at first, all drilling havm bfen bv hand; bat in the spring of 1S74, eiperimanU with a Burleigh Bur-leigh drill having demonstrated tbe d-vantao? d-vantao? to ba derived from the use of that machine, a carnaso capable oi'sup-porting oi'sup-porting 'x ef thoii drill while ai wors was made, and on th of June, 174, foar were started. The progrcia waa now much more rapid than ever before in the history of tunnelling in the world, and on August 7, in the sime year, two more drills were put to work. Tola made six altogether. From tbat date the averaee progress was over ;UH feet per month up to April, 1877, when the, header having entered the broad Comstock mineral bolt, the beat became ;o intense tha two drills had to La laxen of! the Carriage. From that :iay the arnraco monthly prugresa did IlOt XCCI'U 'J let'I. linn uni t-?r.t'Qu--d uti "interruptedly from lae lime ihat grrnind wa1 broken until In-day, b:t at times onlv two men were at work in the tunnel The greaictt progrefa wa; in Dwember, 187-5, when the hauler was advanced 417 feet, and the least in Octo l.ir 1-70, when it was only a-lvaneed nineteen U-l. The total length of ih tunnel, si stated in the ofiicial chart published pub-lished last (September, ia 2J.17G feet. Tin-tunnel Tin-tunnel bing connected with the (Joro-ilozk (Joro-ilozk wo'king, the next move of Mr. Su;ro will dutiOtlcH ba to l.t north and t.uith d-ift.- to connect with all the minis un tbo lod.'. The work lioa cost nearly Si, 000,000. |