The Mother Lode region of California . rst built and successfully operated on theGold Belt. The design is that of G. G. Gates of Jackson, who has car-ried the concentration of slimes to as near perfection as may be Gates has also designed an end-shake belt concentrator which doessplendid work on slimes. This machine is used in recleaning the con-centrates from the canvas tables. The Gates plant is described at lengthin Bulletin No. 6, California Mill Practices, by E. B. Preston. Sincethe publication of that bulletin, Mr. Gates has made no material changein the design of his plant or
The Mother Lode region of California . rst built and successfully operated on theGold Belt. The design is that of G. G. Gates of Jackson, who has car-ried the concentration of slimes to as near perfection as may be Gates has also designed an end-shake belt concentrator which doessplendid work on slimes. This machine is used in recleaning the con-centrates from the canvas tables. The Gates plant is described at lengthin Bulletin No. 6, California Mill Practices, by E. B. Preston. Sincethe publication of that bulletin, Mr. Gates has made no material changein the design of his plant or method of operating, although the planthas been entirely rebuilt. In its general features it is similar to that atthe Zeila Mine. G. G. Gates of Jackson, Cal., owner. 56 CALIFORNIA STATE MINING BUREAU. GEOLOGY OF ARGONAUT-KENNEDY VEIN. In the Argonaut and Kennedy mines is found a perfect example ofthat class of mineral deposit known as, and called, a true fissure vein. TT^ 7E>o/^ t/cI TJ-tf-Tc/ cyA/s> -V-^o/s^. J 2 CO t tC) O ^?^C7/y^/CT -^^ (7/^3^ ?«? Hi!r--iwit:^^ -^ iy C7/^^ I By the term true fissure is meant a vein or fissure which cuts throughrock formations of either similar or unlike character, Avholly independ-ent of either the dip or the strike of the rocks which form the walls of THE M0TIIF:R lode region—AMADOR COUNTY. 57 the vein. Veins of undoubted fissure type do occur, however, whichconform with strike or dip of the wall rocks, and in some instances withboth. That the Argonaut vein is persistent for thousands of feet in bothstrike and dip is abundantly proven in the extensive workings of theArgonaut and Kennedy mines, the connection of their levels at numer-ous points showing clearly the identity and continuity of the vein inthese mines. The geology of the vein is very simple and may be briefly stated. Thatgeological horizon known as the Mariposa Beds (U. S. GeologicalSurvey), which consists of deposits of clay slate and altered diabase y BlooK
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