During the fall of 1902 the officers of the Mine Developing Company of Cleveland presented the geological department of Case School of Applied Science with several vein sections and specimens of high grade silver ore from their California mine in Colorado. The writer has obtained most of his information concerning the mine from the officials of the company, whom he wishes to thank for both information and specimens.
The California mine, formerly known as the Bell property, is situated on Glacier mountain, about 3 miles from Montezuma, Summit county, Colorado. The ore occurs in a fissure vein having a dip of approximately 30 degrees to the northwest and a strike which varies from 30 to 50 degrees northeast and southwest. The country rock is a coarsely foliated granitic gneiss in which the biotite has altered to chlorite minerals near the vein; this alteration was . . .