So before the discovery was made it was reported that Sydney Beanland had additionally made the discovery of the Hermiston-McCauley Mine. These claims were rather under the ownership of the Beanland Mining Company in 1929. This resulted in further assessment work on the property that was conducted by Paul D. Hermiston, and Robert McCauley, that discovered the gold occurence during the early 1930. The property was later option to the Consolidated Smelting, and Mining Company of Canada, who had also operated mines in Cobalt, and Gowganda.
Gold was first discovered on this property when P.D Hermiston, and his business partner R. McCauley had uncovered this mining operation in 1934. Much attention at the time was looked over in developing a profitable mining project by sinking two exploration shafts. This was rather a small scale mining operation compared to other projects like the Copperfields Mine, the Kanichee Mine, and the Sherman Mine. Some of the non productive mining operations at the time of developing Tamagami were the Big Dan Mine, Lil Dan Mine, and the Beanland Gold Mine.
In 1936, the Hermiston-McCauley Mining Project was taken up for option by the Consolidated Mining, and Smelting Company of Canada, Limited.The newly acquired prospect site was first discovered in Strathy Township, within the Nipissing District. It had also consisted of two claims, that covered 104.34 acres of land within that time period of operating. Most of the development work at the time was focus on conducting 7,816 feet of trenching, and 4,761 feet of surface diamond drilling. Even buildings at the time were being erected that consisted of a 2-story bunk house, and cookery of frame and asbestos siding. An office building at the time was also constructed, and was followed by the development of a change house. Other building that became temporarily used had included a hoist house, a compressor house, and a blacksmith shop. Shaft sinking at the time was also begun when a 3 compartment, vertical, Shaft was sunk to a depth of 47-feet, and was 6 by 16 feet in measurement.
During 1937, the newly developed three compartment, vertical, shaft was experiencing major development, and expanding, It was during that year when the sinking was continued on the No. 1 Shaft that ended up reaching a depth of 184 feet below the surface. A level at the time was also cut and stationed at the 150-foot horizon, and was opened up by 803 feet of crosscutting, which drifting amounted to 2,373 feet. Diamond drilling from underground had also followed suit in which 3,067 feet was done, and a minor amount of surface trenching. totalling 300 feet was done.
Other changes were also made to the surface structures when new equipment was added that included a Mead Morrison Double Drum Hoist, a 100 H.P Caterpillar Diesel engine, and a 360 Cubic foot Gardner Denver Compressor..
Shaft sinking at the Hermiston-McCauley Mine had continued onward when the shaft had reach a depth of 457 feet below the surface in 1938. As development continued there was shortly another level cut and stationed at a depth of 350 feet below the surface. Lateral development at the time had amounted to 2,102 feet of drifting, and 790 feet of crosscutting. A total of thirty one diamond drill holes, having a total length of 3,488 feet, were drilled. Some ore at the time was also taken out, in which amounted to 1,421 tonnes, and 13,151 tonnes of waste was hoisted. Mining at the time had also taken place from January, 1 to November, 30, 1938, in which the option on the property was dropped. Before this option drop was made, it was also reported that the company had calculated all the remaining ore that could be mined from this project. The surface to the 150-foot level contained a minable width of 2.20 feet with an average grade of 0.926 ounces of Au per tonne. A total of 2,447 tonnes was also indicated as reserves from the surface down to the 150-foot level. Another indication was given from the 150-foot level to the 350-foot level that had its own width of 1.20 feet, with an average grade of 1.050 ounces of Au per tonne. This had also given further indications of 1,210 tonnes of ore reserves to the mine. It would also involve another estimation above the 350-foot level that contained a minable width of 1.90 feet, and average 0.480 ounces of Au per ton. This would also indicated further ore reserves of 2,042 tonnes of ore. In total ore reserves, the company calculated a minable width of 1.90 feet, with an average grade of 0.790 ounces of Au per ton, and a total of 5,699 tonnes of ore. It would also include dilutions of 3.00 feet in width with an average grade of 0.50 ounces of Au per ton, and contained a total of 8,998 tonnes of minable ore. After doing a major exploration program and development the Consolidated Smelting, and Mining Company of Canada had drop its options on this property.
It was within 1947, the Property was undergoing more changes when assement work was being done by the Beanland Mining Company on the mine potential economics. In addition to underground development and diamond drilling, there was also extensive surface stripping, sampling, and prospecting undertaken. Other statements by Warriner had also stated that the property was so throughly prospected that the chance of future discoveries by diamond drilling are probably limited. His main sources for exploratory work were in correspondence to detailed maps provided by the Consolidated Mining, and Smelting Company of Canada. However, one ore shoot averaging 10.2 m on the 150-foot level, and another of 9.0 m on the 350-foot level could be considered of ore-grade. There was also an isolated shoot of 9.8 m on the 350-foot level of the Shaver Vein had been also not calculated in the total ore reserves. Prior to development, no raise were driven at the time from level to level on the Shaver Vein Zone. Further examinations on the good values across narrow widths on surface, and on both levels, and location of the shoots give a good indication vertical continuity. Most of the ore reserve calculation at the time was rather provided on the Shaver Vein Zone. A diamond drill hole intersection below the 350-foot level had returned 0.40 ounces across average vein width. No additional ore at the time was also calculated below this level upon preforming this assessment for the Beanland Mining Company.
Moorehouse had provide more information on the mine that had contained two veins at the Hermiston-McCauley Mine Site. The main or south vein, which strikes N. 040 degrees E., had been exposed for a continuous length of 250 feet, and had a maximum width of 5.0 feet. Other intersections of parallel veins are also known to increase the width to 6 feet. Much of the vein had also been cut my a number of minor cross-faults, which strike north-west-south-east, and show a minimum displacement of about 20 feet. This displacement is rather described to be right handed, ie, the east side of the fault has moved southeast with respect to the west side. At its west end, the vein become sinuous, and very lenticular. At about southwest of this vein, narrow curving veins, and short thick lenses of quartz occur in abundance with highly altered quartz diorite. The mineralization of this zone that can be seen on the surface is entirely pyrite, which occurs as patches, streaks, and bands in the quartz, and disseminated in the country rock for a few inches on each side of the vein. Traces of copper were also noted in the outcrop, and carbonate is not abundant in the vein, although it is common in the wall rock. Surface explorations completed by the Consolidated Smelting, and Mining Company of Canada had also indicated a shoot roughly 70 feet in length with gold valuse ranging from a trace to 1.15 ounces of Au over 8.8 feet.
The second important vein known as the Shaver Vein, is located 270 feet north of the main vein zone. On surface its commonly known to strike N 060 degrees E. and has a maximum exposed width of one and a half feet. Mineralization is also largely made up of pyrite, though galena was also observed in this exposure. Specimens taken from the underground working are also well mineralized with pyrite, and galena, and the quartz is grey to white with fractures. The quartz diorite intrusive is also cut by a number of mineralized rusty shear zones, and fractures. Most of these are rather less than one and a half feet in width, but one or two average 3 feet. The principal sulphide in this section is rather disseminated pyrite, but splashes of chalcopyrite were noted in one vein.
The south vein that was place under assessment contains multiple ore grade intersections. On the 150-foot level, there was a total of four different ore length assays made on this level. The first of these gave of 65.5 feet in length with a width of 3.32 feet, averaging 0.152 ounces of Au per tonne. Another length of 15.2 feet with a width of 5.78 feet had given 0.339 ounces of Au per tonne of ore. This also resulted in 47.0 feet ore length with a width of 3.54 feet, and had averaged o.285 ounces of Au per tonne. Further so the last intersection on this level had given off 56.7 feet in legnth with a width of 3.52 feet, and had average 0.128 ounces of Au per tonne. Estimates that were made on the 350-foot level had also given four more ore-grade intersections. One of these had provided 60.0 feet in length with a width of 1.43 feet, and average 0.105 ounces of Au per tonne. Prior to this, another intersection of 29.4 feet in length with a wide of 2.68 feet, had given off 0.388 ounces of Au per tonne. It was also followed by another intersection of 35.5 feet in length with a width of 1.87 feet, and averaging 0.295 ounces of Au per tonne. Much of the last calculation that was made had given off an intersection of 27.0 feet in length with a width of 1.34 feet, and had average 0.203 ounces of Au per tonne. Further intersections were made to the south of the "South Vein" Zone that gave off 32.0 feet in length with a width of 1.31 feet, and had average 0.317 ounces of Au per tonne of ore. One more estimation from this section had also provided a length of 41. 5 feet with a width of 1.30 feet, and had average 0.160 ounces of Au per ton.
Within 1986, Cominco, Limited had drilled six holes, totalling 1,232 m, in which was aimed at testing the Hermiston-McCauley Gold Mine Structure. At present times, most of the exploratory work was focus on the No. 1 Shaft, that had revealed two important veins. Much of the main vein is known to be associated with pyrite that contains traces of copper. Surface sampling of a 20 m long shoot revealed gold values ranging from trace to 1.15 ounces gold per ton over 2.7 m. The mineralization within the Shaver Vein is known to mainly consist of pyrite, and galena. A calculation on the ore reserves at the time had yield 8,998 tonnes of 0.50 ounces of Gold Per Tonne over a mining width of 0.91 m.
Geology of the Hermiston-McCauley
The area is rather covered by a shear ryholite, which also locally shows spherulitic, agglomeratic structures that are commonly known for underlining much of the property. It's rather in the Southeast and Northwest corners, where andesitic rocks rather become very much so associated by the ryholite formation. Volcanics within this portion of the Temagami Area have also very much so been intruded by a sill of altered quartz-diorite, which has a maximum horizontal with of 600 feet or more. This sill rather strikes at an angle of N. 050 degrees S, and has a dip to the south, in which it disappears under Net Lake to the north. To the south it rather extends through the claims, and at the much Southwesterly part it become fairly narrowed down. The irregular north contact of the sill it also fine grained, chilled phase, which passes into a much medium grained, massive, altered quartz diorite. This are at one point was very well exposed near the mine office, and on the road that leads towards the shaft operation of the main zone. Much of the mineralization is also located in the central and northwestern part of the sill, in which the diorite in this location has been extensively sheared, silicified, altered, sericitized, and pyritized. It's also concluded that the altercation seems to also be more intense where the mineralized zones and fractures are most abundant, in which the intrusive have been cut by greenstone and lamprophyre dikes. Porphyries within this location are shown to have cute the quartz diorite in regards to the plans of the underground geology map.
In addition to surface work completed, underground exploration had rather totalled about 4,000 feet that was done on the 150- and 300-foot levels of the mine. The main or South vein that strikes N. 040 degrees E has been exposed for a continuous length of 250 feet and has a maximum width of 5 feet, but in some sections parallel veins rather increase the total width of quartz to 6 feet. A minor amount of crossfaults are also known to cut the quartz brining in which strike northwest-southeast, and show a maximum displacement of 20 feet. The direction of this displacement is rather right handed I.e. the East side of the fault location has moved southeast with the respect of the West side. Southwest of this vein, narrow curving veins and short thick lenses of quartz occur in some abundances in highly altered quartz-diorite. The mineralization that was observed on the surface is principally pyrite, molybdenum, which occurs in patches, streaks, and bands in quartz that are disiminated in the country rock for a few inches in each side of the vein. Traces of copper were also observed, and carbonates are rather not abundant in the vein, but is rather common in the wall rock. Sampling prior to mining this property had also indicated an ore-shoot that was roughly 70 feet long and had associated gold values ranging from trace to 1.15 ounces over 8.8 feet. Development and production had rather came from this ore-shoot on the first level of the mine workings that graded 0.388 ounces of gold (Au) per ton over 3.32 feet for a length of 34 feet. Other sections of the mine working within this ore-shoot had given much lower values in gold (Au), and was roughly 100 feet long on the 150-foot level.
In an area 250 feet southwest of this shoot, two smaller shoot totalling 95 feet in length, are known to carry some what lower values in gold (Au). Much of the second level East Zone had rather failed to provide commercial grade ore, and in the West end the various mineralized sections were much narrower, in which values were being obtained in widths of 1.3 to 2.6 feet. During parts of the summer in 1941, Paul Hermiston had rather discovered a much narrower zone of mineralization in andesite near the northeast corner of the Hermiston-McCauley Property. Much of the sheared porphyre and andesite had rather been silicified and mineralized by fibre minerals (jamsonite), pyrite, spharerite, and chalcopyrite. At places this mineralization is rather 2 feet wide, and is reported to have contained 0.288 ounces of gold (Au) per ton of ore. It has also been traced for 30 to 40 feet to the West, but the values were reported to have not been that great. At about 15 feet to the East, a blueish grey flakey mineral with pyrite in a 3-inch shear zone carries silver but has no gold value associated with it.