LINDGEEN.] MINING DISTRICTS EAST OF THE BASIN. 695 



in porphyry, which has been impregnated with auriferous sulphides 

 by thermal action. The ore will probably be base in depth, but near 

 the surface a considerable amount of free-milling ore exists. 



The Mountain Queen mine lies on Grimes Creek, 3 miles above the 

 Pioneer, at the southern edge of the porphyry dike and about one- 

 fourth mile from the Morning Star claims. It is probably not the 

 extension of the latter, but a more southerly vein. A few years ago 

 a 20-stamp mill, driven by water power, was constructed on this prop- 

 erty .and ran two years. At first the ore is said to have been taken 

 from a well-defined quartz vein, but later the mineralized porphyry 

 was mined and milled and was found too poor for profitable work. 



The porphyry dike extends eastward toward the high hills east of 

 Grimes Pass, but was not followed and examined any farther. At 

 Charlotte Gulch, on the east side of Grimes Pass, are many claims 

 which on the decomposed surface carried much free gold. The 

 veins contain pyrite, galena, and blende, with a small amount of free 

 gold. Mr. Woods, of Placerville, states that there is evidence that 

 those veins have been much disturbed by faulting. 



MININ& DISTRICTS EAST OF THE BASIN. 



The Summit Flat mining district lies on the headwaters of Elk 

 Creek, Clear Creek, and Moore Creek, at elevations of from 6,000 to 

 8,000 feet, and 12 miles north-northeast of Idaho City. At the head- 

 waters of Elk Creek are the Barry, Peerless, King, and other veins, 

 while the Wilson group of claims lie a little farther north. The veins 

 generally strike east to west, or a little north of east, and dip south 

 at steep angles. In character they are apparently well-defined, wide 

 fissure veins carrying much quartz, chiefly free milling, though 

 bunches of sulphurets may occur. The Mammoth claim in the 

 Wilson group is opened by means of an incline 325 feet deep, expos- 

 ing a considerable body of ore. There are two small mills in this 

 mining district. This region was not visited by the writer in 1896. 



Between Summit Flat and Kempner, 10 miles to the east, are many 

 prospects with only slight developments, partly carrying gold ores, 

 partly silver ores. Placer deposits occur at many places along Lost 

 River and Bear River near Kempner. Twenty-two miles northeast 

 of Idaho City the silver mines of Banner are located, which produced 

 considerably before the recent fall in price of silver. Between 1882 

 and 1894 the total silver production of this district probably 

 amounted to $1,500,000 or 12,000,000, reaching a maximum of over 

 $200,000 in 1892. At present these mines are shut down. The 

 deposits are large, well-defined quartz veins carrying rich silver 

 sulphides. 



Gold-quartz veins have been found on the southwestern slope of 

 Sunset Mountain, and several claims have lately been located on 



