<68 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



vice versa. The principal lode mines, of which there are very many, 

 are the Oro Fino system, including the Oro Fino, Ida Elmore, Golden 

 Chariot, Minnesota, Mahogany, and Cumberland mines; the Poor- 

 man system, including the Poorman, Silver Cord, and others; the 

 Empire system and the Florida Mountain system, including the 

 Black Jack, Trade Dollar, Mammoth, Tip Top, Ontario, and others. 

 A specimen of high-grade gold ore from the stope between the 150 

 and 300 foot levels of the Black Jack mine, collected by E. L. 

 Jones, jr., contains abundant pale yellow grains of mossy gold in 

 cavities in quartz from which the sulphides have been removed by 

 oxidation. Specimens in the gold ore collections of the National 

 Museum from this district include specimens from the Ida Elmore, 

 from the Mahogany mine, showing gold with finely disseminated 

 argentite and native silver (Cat. Nos. 14774-14776, U.S.N.M.), 

 from the South Chariot mine (Cat. No. 14,777, U.S.N. M.), and the 

 Red Jacket mine (Cat. Nos. 14781-14782, U.S.N.M.). A specimen 

 from the Minnesota mine contains gold with finely disseminated 

 argentite in narrow banded quartz-adularia veins (Cat. Nos. 4477, 

 14783, 14784, U.S.N.M.). A specimen from the Carson mine 

 shows gold in limonite in the center of coarse comb quartz veins 

 (Cat. No. 4478, U.S.N.M.). A specimen of unoxidized ore from the 

 Ida Elmore mine contains gold in rather large grains in bluish quartz 

 with disseminated sphalerite and galena (Cat. No. 65675, U.S.N. M.). 

 A specimen from the same mine (Cat. No. 55786, U.S.N.M.) is a 

 brilliant crystalline sponge of pale yellow gold. Placers, although 

 now thoroughly exhausted, were worked extensively in this district 

 in its earlier years. Jordan Creek and especially Blue Creek were ex- 

 tensively washed. Rich pay was also found in the gulches leading 

 eastward from War Eagle Mountain. The richest placers led right 

 up to the outcrops of the veins. Placer washing on a small scale 

 continued for many years, chiefly by Chinese miners. One of their 

 operations produced $20,000 in 1870. The placer gold is very pale in 

 color and is worth only $10 an ounce. It is little worn. Two 

 nuggets from Reynolds Creek, Booneville (Cat. No. 55777, 

 U.S.N.M.), are well rounded and contain three-fourths quartz and 

 one-fourth gold by volume. 



The De Lamar district is a continuation of the Silver City district; 

 the veins are filled fissures in rhyolite, accompanied by alteration of 

 the country rock. The De Lamar, the principal mine, has produced 

 about $6,000,000 in gold and silver. The ore is platy, laminated, 

 pseudomorphous quartz (q. v.) containing only three-fourths of 

 1 per cent of metallic minerals. The values are chiefly in gold, 

 although certain stopes produced rich silver ore. The greatest pro- 

 duction was from 1891-1897. The other mines in the district, in- 

 cluding the Henrietta, are principally silver producers. 



