OTLIEK DEPOSITS NEAR NEW ALMADEN. 325 



850 feet below the summit of Mine Hill, but below that level no ore bodies 

 have as yet been met with. The strike of these deposits is at an ang-le of 

 over 70° to the deep fissure of the New iVlmadeii, and both fissures stand 

 at considerable angles to the main axis of uplift. 



Near the New Almaden and the Washington is the Cora Blanca mine, 

 the position of which, with a horizontal projection of the ore bodies, is 

 shown on Atlas Sheet VIII. Portions of it were accessible to me, but no 

 work was being done upon it. Though the rocks inclosing this deposit are 

 members of the metamorphic series they are less modified than usual, and 

 in part are but little contorted, though standing at a high angle. One of 

 the strata, which is usually close to the ore, is a magnesian limestone. 

 Some native quicksilver was found in the mine. The gangue minerals 

 accompanying the cinnabar are*lalmost exclusively carbonates. There are 

 clays and evidences of disturbances in the Cora Blanca, but less marked 

 than in the New Almaden. The ore-bearing solutions have followed the 

 bedding for the most part, and in places the deposits can be classed only 

 as a bedded vein; but not infrequently the ore crosses laminse and often 

 fills chambers adjacent to the main ore-bearing surface. These are in part 

 reticulated masses and in part impregnations in sandstones. The ore was 

 followed to a depth of 750 feet below the summit of Mine Hill. The strike 

 of this deposit is about N. 18° W. magnetic, or very nearly true north and 

 south. The direction has doubtless been influenced by the fact that the 

 partings between the beds oifered a comparatively slight resistance to rupt- 

 ure. Tlie average dip is about 40° to the west. 



The Enriquita._The Euriqulta mine is also on the property of the company 

 which owns the deposits described above. It has long been abandoned and 

 no part of the deposits is accessible. The ore-beai-ing ground was about 

 five hundred feet in length and had an extreme width of about sixty feet, 

 tlie dip being nearly vertical. From a manuscript report of Mr. Louis Ja- 

 nin, which he has kindly shown me, I see that the ore was found in lime- 

 stone inclosed on both sides by serpentine. The ore formed rich pockets, 

 connected by stringers, and the lowest body, the San Jose, was the richest 

 of all. The mine possessed reduction works and in a short time yielded 



