exdlicxi.] ECONOMIC GEOLOGY GOLD. 143 



those of tlie schists. At that locality the latter show the usual varia- 

 tions "with certain zones ; <?. g., substitution of hornblende or chlorite for 

 mica. The width of the vein varies from 2 to 5 feet, as a rule growing 

 wider with increasing depth. Granular quartz composes the gangue- 

 rock. Near the surface this quartz is stained red and brown from the 

 decomposition of pyrite. In certain portions of the mine it is very much 

 shattered and may be easily worked out. Gold occurs free within the 

 ■ ■ surface-ores " to a depth of about 80 feet. It is primarily contained in the 

 pyrite, but upon decomposition of the latter appears native. It occurs 

 partly as line gold, partly coarse, and is found either directly imbedded 

 in the quartz or contained in small cavities. Below the depth of 80 feet 

 the pyrite is fresh. Curing 1870 the average yield of ore per ton is said 

 to have been $75, sometimes running much higher, however. 



The ore from the Cariso was crushed in a live-stamp mill, located on 

 Willow Creek, about a mile below South Pass City. 



Young America. 



A few hundred feet east of the Cariso the Young America is located. 

 It retains the same strike and dip as the former, and appears to be a 

 continuation of the same vein. A shaft 128 feet in depth has been sunk, 

 and some work was formerly done there. At the time of my visit no 

 work had been done for some time, and the mine was inaccessible. Judg- 

 ing from the ore on the dumps, the gangue-rock consists of quartz very 

 much splintered. Decomposed pyrite produces a red and brown color 

 in it. I was informed that the ore carried a considerable quantity of sil- 

 ver, and paid about $25 per ton. 



Wild Irishman. 



This vein is located a short distance west of the Cariso. It trends in 

 the same direction, and is conformable to the structure of the schists. 

 At present it is abandoned. It appears that toward the west the vein 

 splits, admitting a horse composed of gneissic and syenitic schist. I 

 could not fully determine whether the Wild Irishman is a continuation 

 of the Cariso, owing to the fact that the surface is obscured and the 

 workings not accessible. 



Some of the lodes in this vicinity, not worked, however, are the Wash- 

 ington, Grecian Bend, Flora, Duncan, and others. 



Atlantic City is situated on the stage-road from South Pass to Camp 

 Stambaugh. Originally of not as much importance as the former, it 

 has lost less by the decline of mining operations. 



Buclceye Mine. 



This mine is located about a mile to the northwest of the town. It 

 was discovered February 18, 1867, by " Judge " Lawn. The present 

 owners are Messrs. Lawn, McBurk, and Dawkins. The mine is located 

 on the north side of a steep gulch, near the summit of a narrow ridge. 

 A partial caving in of the lower drift, and water in the shaft, made it 

 impossible to visit all the workings. Syenitic schist is the country-rock 

 striking nearly east and west at this locality. The schists are thinly 

 bedded, sometimes contain mica, and then are laminated. Curves and 

 ramifications are shown in the vein. Its strike is north 30° east, nearly 

 at right angles to that of the schists. So far as could be determined, the 



