Some more development on the McMillan Gold Mine would end up taking place in 1927, when the McMillan Gold Mines Limited had further expanded this project. In addition much of this expanding was mainly confined to further sinking phase of the two compartment shaft operation. Company officials had also wanted to complete the sinking phase as the shaft was now reaching 550 feet below the shaft collar. In general much of this mining operation was than opened up with new levels that became cut, and stationed on the mines 225, 325, 525 foot sections. Further so these newly establish levels soon had opened up this mining operation further with a small amount of drifting, and crosscutting. These newly constructed mining levels soon had consisted of veins that became discovered from Diamond drilling on the mines 325, and 520 foot levels. During 1927, the McMillan Gold Mines Limited would not open these sections up as the year had slowly came to it's ending point.
By the following year in 1928, the McMillan Gold Mines was rather being further explored as development was taking place on the mines 325, and 525 foot levels. A huge amount of lateral development would also take place as the 325 foot level became opened up by an East drift that traveled for a distance of 737 feet. It was also continued by a west drift section that was constructed to the west of the No. 1 shaft, and had been driven for a distance of 362 feet. Some major development procedures would also take place on the East Drift section when it was opened up by 468 feet of crosscutting. Another section that was known as the West Drift became also opened up as 68 feet of crosscutting had soon taken place on the 325 foot level of this mining operation.
Company officials from the McMillan Gold Mines Limited had also place new development phases on the mines 525 foot level. Much of this development would be further opened up by an East Drift that travelled for a distance of 1,600 feet. This newly constructed level had soon opened up even more ground when a total of 500 feet of crosscutting became achieved within the year of 1928
From all of this development the company would report that the greater amount of work was taking place between the shaft, and the Diabase Intrusion that's found at a distance of 400 feet to the east of the mine shaft. Much of this geological structure is known to be opened up on the 325 foot level as company officials had assayed this vein to contain $9.33 in gold per a tonne of ore that stretches out for a for a length of 282 feet. Another major vein zone was also encountered on the mines 525 foot level that soon assayed $10.40 in gold per a tonne of ore that has it's own length of 267 feet. Company officials from the McMillan Gold Mines Limited would also determine this mine to contain an average grade of $9.90 in gold per a tonne of ore that came with an average length of 270 feet, and an average width of 40.2 inches. Even with this estimation the company was not able to determine the average grade on the 525 foot level as a much larger ore-body was discovered from diamond drilling that totalled 2.350 feet of core sample. The reason for this to have occurred was because this ore-body was not further developed yet, and the vein structure in the No. 2 pit was not opened up in 1928. During this time period the company, and it's own workforce had also place further exploration work by drifting west of the shaft operation on the mines 525 foot level. Most of the reason for developing these drifts sections was once used as a way to make more openings for further diamond drilling before crosscutting was to be establish.
Soon enough a large scale development project had taken place in 1929, when the McMillan Gold Mines Limited had further constructed the 325, and 525 foot levels. Further development on the mining zone was now escalating when the 325 foot level became opened up with more drifting, and crosscutting. Almost all expansion procedures towards this production we're now being confined to the East Drift when it was driven for a distance of 977 feet from its previous 737 feet. This newly developed mine expansion would allow more crosscutting on the East Drift when the mine now totalled 514 feet of crosscutting. Another mine section known as the West Drift would also achieve a small amount of drifting when it had only totalled 369 feet of drifting, and 115 feet of crosscutting.
A new section of the mining operation was now being further opened up when the 425 foot level became constructed in 1929. More so company officials would additionally open this section up when a huge amount of drifting was taking place to the east of the shaft, and had totalled 345 feet. Within this development phase the company would also construct the east crosscut that was driven for a distance of 48 feet. It would also be serviced by the East Winze shaft that was additionally sunken to only 10 feet within in this time period of being developed. In addition to this the mine also became opened up by a small amount of raising when two raises became developed for future diamond drill set up, and had totalled 42 feet on the mines 425 foot level.
Another re-examination of the Ore-body soon had taken place on June, 1929, when Percy E Hopkins reported that the gold average on the 325 foot level graded $7.33 in gold per a tonne of ore. This whole entire examination also had determined the length to be 245 feet, and the width was known for averaging 34.9 inches. Some more exploration procedures would also take place on the mines 525 foot level when new assaying results had identified the two ore-bodies to contain $7.93 in gold for a length of 214 feet each, and had it's own average width of 43.9 inches. All production, and development on the McMillan Gold Mine was reported to have suspended by the end of 1929, due to a lack of financial funding.
After being abandoned for nearly three years the McMillan Gold Mines Limited was once again back at the mine site on June, 15, 1933. This time much of its own mine workings we're completely flooded with water that soon resulted in adding water pumps towards this production business. By no time this company was well off with this production business once again, when it had sunken the two compartment shaft to another 100 feet as it was reaching a depth of 650 feet. It soon became evident that the company was rather focusing on opening this mining operation even more when the 625 foot level was cut and stationed. During this time period the company, and it's miners were constructing a small amount of lateral development that soon totalled 302 feet of drifting, and 53 of crosscutting on the 625 foot level. The main reason for this to have happen was because the company wanted to mainly explore for more vein zones within the 625 foot level. Even the original power plant was still active, and had consisted of the following components to run this operation that included a 125 H.P Boiler, a 9 by 12 inch jenckes single drum hoist, and its very own 345 cubic foot Sullivan Steam Driven Compressor. In addition the McMillan Gold Mines, Limited would also add a newly constructed bunkhouse in order to provide accommodations for those who wanted to live near the mining operation. Nothing else was strongly known to have occurred during this time period as the company was mainly confined to sinking the shaft further, and constructing the 625 foot level as this became completed.
Some more expansions would be underway when the McMillan Gold Mines, Limited had decided to engineer it's very own 125 tonne cyanide milling facility in spring of 1934. Much of this whole entire milling facility was commonly considered to consist of a 12 by 20 inch Jaw Crusher, a Newhouse Crusher, a 7 by 5 1/2 foot ball mill, a 5 by 26 foot Dorr Classifier, two 8 by 8 foot Oliver Filters, and a Merrill Crowe Continuous Precipitation unit. Production from the mine during that year was commonly known to have treated a total of 12,313 tonnes of ore from the on-site milling facility. Before any production was to take place the McMillan Gold Mines, Limited would have to add additional electrical power that was connected from Española, to the mine site. In addition to this the company would also install a brand new power plant that consisted of a 1,000 cubic foot electric compressor, and an Ingersoll Rand Double Drum Hoist. Besides only developing the mill the company also place huge construction phases towards other structures which included a refinery, managers residence, a dry house, cook house, assay office, and a small office building.
Besides developing the much needed structures the company, and its crew of 84 miners would also place huge development phases towards its underground workings. Much of this constructing was taking place on the mines 225 and 325 foot levels when shrinkage stopes became establish. Not to mention the company would also place further development on the mines 225 foot level as it now had consisted of 365 feet of drifting, 0 feet of crosscutting, and 32 feet of raising. Another level that was located on the mines 325 foot level was opened up by 1,355 feet of drifting, 504 feet of crosscutting, and 302 feet of raising. More development would also escalate on the mines 425 foot level when it had consisted of 333 feet of drifting, 95 feet of crosscutting, and 32 feet of raising. Production was also taking place on the mines 525 foot level when it had consisted of 1,609 feet of drifting, 639 feet of crosscutting, and 45 feet of raising. Even the mines 625 level became further developed when 768 feet of drifting, 143 feet of crosscutting, and 50 feet of raising was done. Nothing else was known to have occurred during the time period of 1934 as the mine was being expanded, and explored.
Company officials from the McMillan Gold Mines, Limited would also place development phases on a winze shaft that was sunken on the 625 foot level in 1935. In all development the new internal winze shaft was now reaching great amount of depth when it was sunken 275 feet in order to intersect the 900 foot level. Even more lateral development was now being commenced when the 750, and 875 foot levels became stationed, and cut. In general being the 750 foot level was opened up by 177 feet of drifting, and 14 feet of crosscutting. While the 850 foot level was achieving smaller amounts of development that totalled 118 feet of drifting, and 45 feet of crosscutting, Besides developing these levels the company also expanded the 225 foot level with 64 feet of drifting that totalled 429 feet of drifting all together. Besides drifting the level also became further expanded by crosscutting when the company's miners had constructed 13 feet of crosscutting. In all development the company would place major development phases on shrinkage stopes that became establish on all levels except for the 750, and 875 foot levels.
Besides developing the mine further production was also taking place when the mill treated significant amount of ore that totalled 40,213 tonnes in 1935. Further so the company would also add an addition to the milling facility when concentrating jigs , and Amalgamation equipment became installed. In all production the company reported that 33,814 tonnes of ore was obtained from the stopes, 633 tonnes from development, and the balance from surface dumps. Company officials from the McMillan Gold Mines Limited had a steady workforce of 82 men who became employed towards this mine production. Nevertheless, the company also took more serious action when it had completed a large scale drilling program that totalled 1,478 feet of surface core samples, and 2,407 feet of underground core samples.
By the following year in 1936, the McMillan Gold Mine was undergoing further exploration for the next three months as diamond drilling took place. This would also place small development stages on the mines 875 foot level that was further driven by a drift for a distance of 47 feet. Prior to this development the company was suspending all mining operations until the middle of July, 1936 when more diamond drilling would be establish for three months. With new indications of gold reserves the company had also place further extractions on stopes that we're located on the mines 525, 750, and 875 foot levels.
Even production from the on-site milling facility had treated a small amount of ore that totalled 3,656 tonnes of ore bearing material. The reason for this to have occurred was because the 125 tonne cyanide mill was only in production from November, 21, 1936. By this time the company also down size significantly in its own workforce as a total of 18 men became employed.
Soon enough the company continued to further construct this project when stoping was done on the mines 526, 750, and 875 foot levels. In addition the mill would keep production flowing as it soon treated another tonnage of ore that processed7,608 tonnes in 1937. By March, 1937, the McMillan Gold Mines Limited would decided to sell the plant, and it's milling facility as it was no longer interested in this project. It was also reported that this mine had produce significant amount of gold and silver that totalled 87,618 g of gold, and 2,613 grams of silver. This ore-body is recognized to be similar to the Majestic Gold Mine that's located right next to the McMillan Gold Mine.