METALS AND THEIR ORES. I9 



probable that not less than one fourth or one fifth of the total amount of 

 gold present in the vein has been lost in the milling process, so that the 

 actual results obtained do not fairly represent the true value of the rock. 



Since 1869 three shafts have been sunk upon this vein, two of them 

 to the depth of 100 feet, the third about half as much. The quality of 

 the rock at various parts of the shafts and cuttings is not uniform. 

 Some who have engaged in milling the quartz became discouraged on 

 account of the small yield. By protracting on a scale, when the facts 

 were fresh in my mind, the rich and poor portions of the quartz, I dis- 

 covered a uniform method of arrangement. The richer portions occupy 

 a definite part of the vein called a "shoot" or "chimney" by miners. 

 The vein-sheet dips north-west, but the chimney dips to the north-east. 

 It cannot be distinguished in the rock except by those handling it every 

 day. In other kinds of metaliferous veins this phenomenon is very dis- 

 tinct, showing itself in a swelling of the mass, forming a bonanza. The 

 thickness of the quartz vein is constant, and where it increases in rich- 

 ness the bulk is the same as before. The best method of discovering 

 the rich and lean ore is by experiment. 



There is a second quartz vein upon these properties, about eighty feet 

 to the north, but it has not proved productive. Excavations made to the 

 south-west upon the first Dodge lot have shown the presence of the orig- 

 inal vein nearly to the edge of the property. 



I learn that operations upon this vein are to be resumed immediately, 

 or in the spring of 1878. 



Other Qnartz openings. A few other veins similar to the above occur 

 in Lyman and its vicinity. One of the most noted is the Bedell mine, 

 about a mile farther west. The mineralogical character is the same as 

 that just described. It is two feet wide. Specimens showing much free 

 gold are easily obtained. I panned out several pieces of gold from a 

 shovelful of earth scraped from the top of the ledge, and saw much richer 

 yields in the hands of others. A reliable assay of it in 1869 showed $\2 

 to the ton of gold present. There is more galena than usual in the vein, 

 carrying ^33 of silver to the ton. A shaft has been sunk to the depth 

 of 20 feet. 



Near the Haviland copper mine is the Hartford or Moulton mine. A 

 shaft has been sunk about 100 feet. At the depth of 23 feet the quartz 



