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My apologies I am trying to get my head around it to and trying to build a full picture.. Are we talking about alluvial deposits or quartz reef near surface epithermal deposits? As you know alluvial mining is very different from conventional open cut and underground mine. They too are different beasts from each other. Another factor have you got other the mining leases for the area involved. Also the inpurites in the gold has value in itself. Such as silver etc.
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Mine data gives an overview of site.
Location: The Moore Creek Mine is shown on the USGS 1:63,360-scale topographic map. The coordinates are at the center of the mine in the SW1/4, section 15, T. 29 N., R. 42 W., of the Seward Meridian. The location is accurate. The Moore Creek mine is locality 37 of Cobb (1972 [MF 363]); also described in Cobb (1976 [OFR 76-576]).
Geology: The Moore Creek Mine is a placer gold deposit that has worked several ages of ancestral terrace gravels as well as modern stream alluvium. The paystreak, as defined by exploration and mining, is about 2 miles long and 300 to 1,300 feet wide. The fluvial pay gravels, which are composed of rocks of local derivation range from 12 to 20 feet thick and are overlain by 5 to 7 feet of overburden. The principal heavy minerals identified in concentrates include native gold, cinnabar, scheelite, native silver, tetrahedrite, chromite, magnetite, and zircon (Mertie, 1936; Bundtzen and others, 1987, 1988; McGimsey and others, 1988). Concentrates from mining contain up to 35.00 percent chromite, i.e., a low grade chrome resource. A mineral separate of screened, minus-28-mesh material from a 100-kilogram, bulk sample of gravel contained 2,300 parts per million (ppm) chromium, 5,200 ppm titanium, 70 parts per billion (ppb) palladium, 200 ppm nickel, and 8.25 percent iron (Bundtzen, Laird, and Lockwood, 1988). The gold fineness averages about 758, which is low as compared to other deposits in the Innoko or Iditarod districts (Smith, 1941 [B 910]).
Gold nuggets up to 19 ounces in in weight have been found in the deposit. The high chromium content of the placer concentrates is somewhat enigmatic as there are no known masses of ultramafic rock in the area. The source for the gold, silver, tungsten and mercury minerals is probably a mineralized monzonite intrusion and its contact zones about 1.2 mile to the northwest and upstream of the placer deposit (see Broken Shovel lode, ID081). The northeast-trending Iditarod-Nixon Fork fault forms the southern structural boundary of the Moore Creek pluton and Bundtzen, Laird, and Lockwood (1988) have postulated that the Late Tertiary to Pleistocene placer deposits at Moore Creek may have been successively offset right-laterally by transcurrent fault movement and the oldest placers occur southwest of the pluton. From 1911 to 1986, at least 53,990 ounces of gold and 12,520 ounces silver have been recovered from the Moore Creek placer deposit (Bundtzen and others, 1988; Miller, Bundtzen, and Gray, 2005). About 1,383 ounces of gold and 64 ounces of silver have been produced from nearby Nevada Gulch, mainly from 1911 to 1929.
Workings: Gold was discovered on Nevada Gulch, a short tributary of Moore Creek in 1910 (Maddren, 1911) and the Discovery claim on Moore Creek was staked in 1911 (Mertie, 1936). Shallow deposits were worked by opencut scraper and hand methods in the first 20 years of operation. In 1913, some ground was being prepared for a dredge; however, a dredge never operated on Moore Creek. In 1927, a Northwest dragline, one of the first in southwest Alaska (Smith, 1931) was brought into the district for exploration, development, and mining. By the 1930s, mechanized placer mines equipped with draglines and bulldozers dominated activities in the district. The dragline stacked tailings in regular, linear tailing piles up to 6 meters high down the valley of Moore Creek.
In the mid-1930s, the USSR&M company initiated a churn drill program in Moore Creek basin with the idea of developing ground for a large-scale dredging operation (Smith, 1937). Large scale mechanized mining was nearly continuous until Statehood and then intermittent through 1986. Small scale exploration and development activities continued through 2001.
Age: Not dated; however, older terrace deposits are inferred to be Late Tertiary to early Pleistocene, based on similarities with other dated deposits in Interior Alaska (Hopkins and others, 1971). Pleistocene fossils (mammoth and horse bones) in the overburden were dated at 36,000 BP with radiocarbon methods (Jeff Kline written communication, 1986).
Production: From 1911 to 1986, at least 53,990 ounces of gold and 12,520 ounces of silver have been produced from the Moore Creek Mine (Bundtzen and others, 1988; Miller, Bundtzen, and Gray, 2005). About 1,383 ounces of gold and 64 ounces of silver have been produced from nearby Nevada Gulch, mainly from 1911 to 1929. Beginning in the early 1930s, Gus Uotila, Charlie Uotila, John Ogriz, and Elmer Keturi operated the first bulldozer-based placer mine and established Moore Creek Mining Company. More than 70 percent of the total historic production occurred from the mid 1930s to about 1955, when a highly successful dragline/bulldozer plant operated by Elmer Keturi and Jules Stuver mined the deposit. Annual production ranged from 2,000 to 6,500 ounces of placer gold throughout the 1930s and the 1950s (unpublished U.S. Mint records). From 1933 to 1937, the Moore Creek Mining Company was the largest producer of gold in the Iditarod District (Smith, 1936, 1936, 1941 [B 926-A]). The best year of production was 1937 when 6,500 ounces of placer gold was produced. Moore Creek Mining Company also found abundant cinnabar during mine operations (Joesting, 1942). Work in the 1980s concentrated on recovering coarse nuggets from tailing piles.
Reserves: Not determined. Early dragline operations did not have nugget collectors and coarse nuggets have been found in tailings in recent years. I understand now why metal detectorists had field day detecting over waste tailing.
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Commodities (Major) - Au; (Minor) - Ag, Cr, Hg, Ti, W, Zr
Development Status: None
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).
The current Moore creek mine is for sale 15 million dollars.
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Estimated operational costs.
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And retrieval year costs.
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If we work on this scenario the current mining operation at Moore Creek.
9600 dollars per day 12 hour operation. Providing no breakdowns. 499200 dollars per year 52 weeks a year. Not assuming winter shut down. For 15 million price tag It would take 30 years to recoup the original investment. 892800 dollars yearly operational costs. Not counting rising inflation. A partnership with mining lease holder. A cash injection partner without the price tag. There is operational issues with site not getting access by road. If of course your area of suspected gold deposits falls within those leases that are currently up for sale. It appears the current operation could do with more efficient mining methods.
Any prospective miner or investor will do their due diligence not just on Geo physical survey alone. True past geological search had been rather piecemeal. A good geologist goes a long way. Clearly you need to team up with a junior miner and have full survey into area consisting of exploration drilling some times you can stumble on a Supergene Polymorphism: lurking nearby In placer or near-surface gold deposits, "polymorphic" layers, composed of a variety of minerals (clay, silica, organic material, and bacterioform, nano-micro-particles of gold), can form on the surface of primary gold grains due to biogeochemical transformation (secondary, supergene growth)
At the Spring zone, Full Metal at Moore creek completed seven trenches spanning 300 meters of the strike length. The best intersect was 8.86 grams per metric ton of gold over a span of 11 meters in Trench 20. All the trenches in the Spring zone encountered gold mineralization along their entire length, leaving the prospect open in all directions.
The Troy zone is just to the north of the Spring zone. Trenching in Troy intersected quartz veins hosting strong, coarse gold mineralization running in a large zone of lower grade mineralization. One quartz vein was sampled in three locations over a 50 meter span of the strike length. One 0.2 meter intersect of this vein had an assay return of 88.53 g/t gold. So they must of been close.
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Three trenches were completed at the Broken Shovel prospect about 200 meters north of Troy. All three trenches encountered gold mineralization. The best of the three averaged 0.7 g/t gold along its length. The new JV is planning a 3,000 meter phase-1 drill program. Gibson said Full Metal will drill the Spring and Troy zones on 100 meter centers along strike length. The exploration geologist said gold grades seem to be increasing to the southeast, and step-out drilling is planned in that direction to test for mineralization. The company also hoped to locate the Iditarod-Nixon Fault with the step-out drilling. The huge Donlin Creek gold deposit is located 55 miles from Moore Creek on the other side of the Iditarod-Nixon Fault. ( Is this your Golden fissure 500 feet to 1000 feet wide that runs 40 miles! ) You don't have to answer as it is proprietary information.
Your research is interesting and does much to confirm the source of alluvial gold in Moore creek is flowing from a weathered epithermal deposit. Judging by the coarse gold the gold reef is near by, feeding into Moore Creek? Earlier results in early 2000 was rather disappointing. But technology has changed greatly since then.
But it will come down to cost of extraction to profit margin. Enough the weather gold price fluctuation per ton of ore mined.
Crow