Another huge change was shortly after made when another prospector known as D. Derosier had staked this property in 1957. It was during this time when a road was constructed to a newly developed cabin from Sandy Inlet via Coppersand Lake. Nevertheless a drill road and a trail became establish through the bush line at Sandy Inlet in order provide easier transportation to the mining site. By this time the company would undergo its own exploratory procedures when some trenching became conducted. In addition the company would also drill one short vertical diamond drill hole to determine what was hidden beneath the ground. Grab Samples taken by Derosier had given the following results upon assay. Copper was found to average 1.36-10%, Silver was assayed up to 5.32 ounces per a ton, and another assay of lead was recovered and had graded 3.95%.
The prospector would later option three mining claims around Coppersand Lake to the Mayer Mining Company, Limited, in 1960. Further explorations were continued when the company drilled 6 diamond drill holes on a flat lying quartz vein that wasn't located to far from Coppersand Lake. Logs of another six diamond drill holes would also be summited in 1964 for assessment credit. These exploratory zones had soon indicated a thick quartz-carbonated vein that consisted of Chalcopyrite, and Pyrite. But with not enough encouraging results the company also decided to fold, and the mine once again became abandoned.
In 1965 the mine was undergoing new staking's when the Keevil Mining Group Limited had taken over this production. A small exploration phase was known to have been conducted within this time period that consisted of a Ground Geophysics Survey. It was also reported that the company was undergoing assessment phases on two of the many claims that make this mining zone. These historical claims became registered under T-55445 and T55446. Much of this mining zone was also reported to have been optioned to the Keevil Mining Group Limited by the previous owner who was Mr. Derosier. Generally this whole entire staking was establish to further explore the copper showing within this geological area. Exploration work consisted of line cutting, and geophysical surveys that became conducted within the period of October, 20th to December,2nd, 1965. A grid totalling approximately three miles of line was cut from a base line to the north of the property. Lines within this sections became strongly considered to have been cut at 200 foot intervals to the east of the base line. Mining within the Coppersand property was never a productive project as the Keevil Mining Group Limited. had also abandoned mining operations at the Coppersand Mine by 1966.
By 1969, the whole entire prospecting ground was staked by another prospector who was identified as A. Hardie. He immediately commence mining operation when he started to extend the old mine workings, and had additionally blasted some new pits. It was during this period that he would also additionally incorporated his own company that became recognized as the Gunnex Limited. In addition his very own company would further undergo exploration procedures when 20 diamond drill holes, totalling 2,500 feet of core sample became driven within the rock. Further land stripping procedures would also be completed in order to determine what was hidden beneath the ground. The Gunnex Limited would also ship their first 300 ton bulk sample for further assaying procedures. These indications from the samples had given assaying grades of a trace to 0.20 ounces of gold per a ton of rock, silver was assay at 0.06 to 6.25 ounces per a ton, 0.32 to 22.5% Copper, 0.11 to 0.57% Nickel, and 0.06% Cobalt. With not enough encouraging results he to decided to abandoned mining operations at the former Coppersand Mine Exploration Project.