Ross (1933) reported the mineralized rock comprises lenses and seams of massive pyrrhotite and chalcopyrite in silicified limestone containing chlorite and probably other silicates. The larger masses parallel the bedding of the cherty rocks. The strike of the beds in this vicinity ranges from N 20 E to N 55 E with the average closer to the latter. The main trench showed mineralization at intervals throughout its length of about 70 feet but exposed massive sulfide only over a width of 2 or 3 feet about 15 feet from its northwest end. A sample of freshly blasted material yielded on assay 0.22 ounce of gold and 4.90 ounces of silver to the ton and 7.34 percent of copper. Trenches about 45 feet to the southwest on the line of strike show little mineralization. The continuation of the same beds in bluffs about 1,000 feet to the northeast contained no visible copper minerals. A very little copper stain and a little pyrite were present in a limestone bed on the approximate line of strike in the gorge of Long Creek about 2,000 feet to the southwest. There are several scattered pits in the vicinity, but copper was not observed in any of them.

The Copper King prospect is primarily a skarn deposit. The country rocks are hornfelsed Permo-Triassic redbeds that consist of calcareous siltstone, and conglomerate; these have been intruded by Upper Cretaceous(?) quartz porphyry dikes. The deposit chiefly consists of massive chalcopyrite, pyrite, and pyrrhotite in a skarn zone 20 to 40 feet thick that is exposed for about 200 feet at the surface. Subsidiary zones of quartz-stockwork veins and disseminated sulfides also occur (unpublished report by Addwest Minerals International Ltd., 1997). The pattern of mineralization suggests a zonal distribution of copper around quartz porphyry intrusions. This is the only prospect in the district explored primarily for copper and is also the only prospect in the area where arsenopyrite has not been found (Hawley and Clark, 1974). In addition, molybdenite is more abundant here than at other nearby prospects; e.g., the Golden Zone Mine (HE043). Ross (1933) reported a sample yielded 7.34 percent copper, 4.9 ounces of silver, and 0.22 ounce of gold per ton.

Ross (1933) reports several trenches were dug in August 1931 for exploration. The main trench showed mineralization at intervals throughout its length of about 70 feet but exposed massive sulfide only over a width of 2 or 3 feet about 15 feet from its northwest end. A sample of freshly blasted material yielded on assay 0.22 ounce of gold and 4.90 ounces of silver to the ton and 7.34 percent of copper. Trenches about 45 feet to the southwest on the line of strike show little mineralization.