Bulletin . s,assaying 20/^ mercury; and retorted in 2-12 pipe retorts. 225 poundsbeing charged per 8 hours. This plant was driven by a 16 h. p. West-ern gas engine. Later, a D retort was installed, with a condensersystem consisting of a 6 pipe, two wooden ])oxes, 2 x 3 x 6 and Eddy, L. H., Jigs on a California dredge; Eng. & Min. Jour., vol. 101. pp. 207-208,Jan. 29, 1916. QUICKSILVER RESOTRCES. 335 2X 3X 4 ami a small blowoi. ^Maiizaiiita, madi-ciic. jind oak ait theavailable fuels. An nnderourreut uiizzly .) Ion*:-, with ^ oi)(iiin>i- is {)laee(l in thelaunder line of the plant on the Ala
Bulletin . s,assaying 20/^ mercury; and retorted in 2-12 pipe retorts. 225 poundsbeing charged per 8 hours. This plant was driven by a 16 h. p. West-ern gas engine. Later, a D retort was installed, with a condensersystem consisting of a 6 pipe, two wooden ])oxes, 2 x 3 x 6 and Eddy, L. H., Jigs on a California dredge; Eng. & Min. Jour., vol. 101. pp. 207-208,Jan. 29, 1916. QUICKSILVER RESOTRCES. 335 2X 3X 4 ami a small blowoi. ^Maiizaiiita, madi-ciic. jind oak ait theavailable fuels. An nnderourreut uiizzly .) Ion*:-, with ^ oi)(iiin>i- is {)laee(l in thelaunder line of the plant on the Alanzanita dump, to reject the coarsermaterial; but no revolving screen was used as at the other plant. TheNeill jig and two tables were driven by a 5 h. p. Standard, distillateengine. In the ravine below the ]\Ianzanita dump, the had,in February, 1916, three men working with rockers, concentratingmaterial ^vhich the rains had washed down from the dump. A fairamount of cinnabar was thus Photo No. 75. Gilpin County (Colorado) Bumping Tables in Mill at .ffitnaMine, Napa County, September, 1913. As the Oat Hill mine dumps have lain out in the weather for someyears, the erosion of winter rains has naturally concentrated consid-erable material from them into the gravels of James Creek and itstributary ravines below the dumps. Lindblom Bros., leasing on landon James Creek, owned by ^Irs. M. Patten, with two rockers were ableto make 30-10 pounds of concentrates per 8-hour day. This yielded30%_40% mercury in a retort consisting of two 4 pipes. In 1915and 1916 there were several others operating similarly, in a small waywith roc-kers. farther down on James Creek, near Aetna these were: A. ]Marro, Joe Paidishich, Bert and Henry Wells. 336 CALIFORNIA STATE MIXING BUREAU. At the Wall Street mine, Lake County, when visited by the writer^in 1913, there was a small Chilean mill and two homemade table-con-centrators said to have a capacity to handle 3^ tons of o
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