Abstract

Various possible ore shoot controls in the Antamok mines have been recognized by using actual veins as models. The results indicate that ore shoots are of two distinct types: (1) subhorizontal pitching ore shoots and (2) moderately to steeply pitching ore shoots. The former typifies a regionally controlled ore shoot where the bottoms of the veins are at almost the same elevation, resulting from the interplay of orogenic uplift, gravity, and pressure of ore solutions; the latter type appears to have been determined by structural controls and to have developed locally. The two ore shoot types occur together and, if the veins are studied individually, the subhorizontal aspect can be easily overlooked.Regionally controlled ore shoots, being dependent to a large extent on the episodic nature of vertical orogenic movements, can be correlated to some mappable manifestations of orogeny. This idea was tested by mapping various levels of stranded terrace gravels to gain some insight into the vertical extent of an ore shoot. Local controls are manifested by accurate mapping of veins on both plan and longitudinal sections and by correlating them with existing ore blocks of the mine.

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