ransome.] DEPOSITS OF RED MOUNTAIN REGION. 221 
little could be ascertained concerning the details of its occurrence. 
According to Mr. J. Owen, the ore changed to iron pyrite, but the 
depth at which the change took place was not stated by him. The 
shaft of the Robinson is sunk alongside one of the mounds of siliceous 
altered breccia characteristic of this region. 
It is stated by Mr. Owen that a distinct vein or fissure was followed 
from the Guston into the Robinson, and was demonstrated b} 7 drift- 
ing to extend into the Genesee- Yanderbilt. The same fissure was 
cut by an east crosscut in the Yankee Girl. 
Gruston mine. — This ore deposit, jusl north of the Yankee Girl, was 
opened shortly after the latter, in 1882. The ore body as exposed at 
that time is said to have been 5 feel wide and carried 58 ounces of 
silver per ton. It was chiefly galena, with some copper mineral, prob- 
ably tetrahedrite. In 1883 the mine produced, according to the Mint 
reports, $57,500. In September, 1887, steps were taken to form the 
present New Guston Company, Limited, of London. England, and 
the mine was closed until June, 1888, when work was resumed with 
Mr. T. K. Schwarz as superintendent, and extensive bodies of ore 
were found on the third, fourth, and fifth levels, yielding in carload 
lots up to 450 ounces of si her per ton. The depth of t lie mine al 1 his 
time was only 288 feet, while the Yankee Girl was down L,050 feet. 
The product for 1888 was aboul $130,000. In 1889 ore was produced 
to the value of over $390,000, and work was carried to the sixth level, 
378 feet from the surface. Mr. -lames K. Harvey this year succeeded 
.Mr. Schwarz as superintendent. At the close of 1889 the mine had 
already paid dividends amounting to £56,374 (about $274,000). In 
1890 the shaft was sunk to the seven! li level and extensive sloping 
carried on in the upper levels. Ore to the amount of 4,469 tons was 
sold, which realized $491,336 (£101,098), or an average of uearly $110 
per ton after deducting treatment charges. Several carloads of this 
ore carried from 600 to 1,400 ounces of silver per ton. The product 
this year was principally from the stopes of the fifth and sixth levels. 
The ore carrying most silver was encountered on the fifth level north 
of the shaft, and contained 12 per cent of copper. At this time there 
were from 200 to 300 men employed in the mine, and the small settle- 
ment of Guston had grown up in the vicinity of the shaft. The water 
pumped from the mine this year was about 35 gallons per minute, 
and is said to have been charged with sulphuric acid from oxidation 
of pyrite. The Mint reports credit the mine with a total output of 
86 1,768 ounces of silver and $57,500 in gold for 1890. The product in 
copper is not given. In 1891 the main shaft had reached the ninth 
level, about 678 feet below the surface, and the water had increased 
to about 50 gallons per minute, being of the same corrosive character 
as that found in the upper levels. The ore raised this year amounted 
to 11,723 tons, which realized $824,467, or an average of over $70 per 
ton, net value. The cost of mining was nearly $19 per ton, while 
