714 IDAHO MINING DISTRICTS. 



TREATMENT OF THE ORES. 



At present only the shipping ores can be utilized, and the question 

 how to make $10 to $20 ore pay is one of the greatest importance to 

 the camp. If it should contain any notable amount of free gold, amal- 

 gamation and concentration will probably be found most economical. 

 Experiments should be made as to the applicability of the cyanide 

 process to these ores. In the absence of notable amounts of copper 

 and antimony the process might be of advantage, but experiments 

 are necessary to prove this. 



DETAILED DESCRIPTION. 



The Lincoln vein is one of the most westerly locations in Willow 

 Creek, being situated about a mile south-southwest of Pearl. The 

 strike is N. 76 W. and the dip steep to the north, the vein being 

 traceable in granite for a distance of one-fourth mile, with good ore 

 at close intervals. The tunnel shows 2 to 10 feet of altered and 

 pyritic granite, with smaller streaks and veins (1 to 6 inches wide) of 

 pyrite, arsenopyrite, and blende, associated with a little drusy quartz; 

 ruby silver has been noted. The developments consist of a crosscut 

 tunnel 200 feet long, with drifts on the vein, and a small winze. 

 Fifteen tons of ore were shipped, averaging $100. A sample of poor 

 ore gave 0.1 ounce of gold and 5.30 ounces of silver, a relatively large 

 amount of silver for this camp. 



The Shamrock is situated a few hundred feet southwest of Pearl 

 post-office, and is developed by an 80-foot crosscut from the creek 

 level, from which drifts extend on the vein. The country rock is 

 very much disturbed granite containing rich but irregular seams of 

 ore. Some tons of the latter were shipped to smelters. 



The Pinto lies a short distance north of the Bishopric mill, in 

 Pearl, and has been opened by 225 feet of tunnels and a 50-foot winze. 

 Sixty tons of ore are said to have been milled, yielding $23 per ton. 

 The vein is about 2 feet wide. The Pearl claim, showing some very 

 good ore, is located in this vicinity. 



The Dynamite, said to be the extension of Pinto, is situated on the 

 north side of Willow Creek, a short distance east of Pearl, the crop- 

 pings being 250 feet above the stream. The vein is opened by a 

 tunnel 200 feet long, strikes N. 68 W. and dips 45 N., and shows 

 16 inches of decomposed vein-matter in granite. A large porphyry 

 dike lies close by to the north. 



The Easter lies very nearly in the continuation of the Dynamite, 

 and is one of the producing veins of the district. The croppings lie 

 in granite 250 feet above the creek and the vein is developed by a 

 tunnel 100 feet below the croppings. Another tunnel was started at 

 the creek level, but has not yet reached the vein, work being sus- 

 pended in 1896 on account of litigation. A considerable amount of 



