Today the property, now owned by Integra Resources, is seeing both a revival of the eponymous mine, and is the site of new, unexplored deposit discoveries.
The DeLamar project is about an hour’s drive from Boise, and host to the historic mine, previously owned by Kinross, which Integra acquired in 2017, with all existing infrastructure in place, including the power grid and water treatment plant.
With sweeping vista views, the DeLamar project spans about 5,300 acres of patented and unpatented claims, comprising the Delamar and Florida Mountain deposits, and War Eagle and BlackSheep districts. A further 4,100 acres of leased lands with approximately 1,575 historic drill holes and 145,940 meters of drilling are outlined in historic databases.
The open pit and underground operation lasted for over 100 years, during which it produced 1.6 million ounces of gold and 100 million ounces of silver until its closure in 1998 due to low metals prices.
The company produced a Preliminary Economic Assessment in 2019 and Pre Feasibility Study (PFS) in 2021. The PFS was based on proven and probable reserves of 1.8 million ounces of gold at 0.45 grams per tonne and 92.4 million ounces silver at 23.27 grams per tonne.
Integra’s two-stage $282 million project envisions a larger scale open pit mining scenario that combines heap leaching and milling to achieve an average production level of 163,000 gold-equivalent ounces per year for the first eight years and a 16 year total mine.
DeLamar and the neighbouring Florida Mountain – a new discovery – will have all-in sustaining costs of $955 per gold-equivalent ounce on a co-product basis, the company said. Black Sheep is another new discovery and a new zone has been identified at Sullivan Gulch.
De risking and exploration drilling
This spring, the Sullivan Gulch exploration results comprised two drill holes, one of which intersected highest-grade silver intersected to date on the project: 4.1 g/t gold and 446.92 g/t silver over 26.97 metres, including 80.4 g/t gold and 14,054 g/t silver over 0.4 metre. Also included in the interval are 13.47 g/t gold and 1,909.45 g/t silver over 5.63 metres, and 40.74 g/t gold and 2,839 g/t silver over 0.76 metre.
Integra is engaging the local community through its ‘Delamar Days’ initiative, to familiarize residents and their families on the plan of operations. The latest community event saw over 150 people attend this summer. There were no objections to the DEIS from five native surrounding Native American Tribes.
This week, Integra announced it completed more than 80% of required fieldwork related to the baseline studies for the filing of the mine plan of operations and that it is moving the DeLamar project forward by de-risking through permitting and expanding the resource through further drilling.
The company has initiated baseline studies that will be fed into the mine plan, which it is planning to file in late 2023 and begun a drill program on the historic low-grade gold-silver stockpiles that were mined and stored by previous operators. The 11,000 m drill program is aimed at growing the oxide resource to potentially expand future heap leach operations.
“This material, once successfully defined, could result in a significant amount of low-cost gold-silver mineralized material being added to future mine plans at DeLamar,” says CEO George Salamis.
Salamis notes that while Kinross was focussed on drilling specifically at one deposit, the Integra team discovered the geology ranges at each zone, and this is visible in the drill core in the onsite shack.
“We now have advanced knowledge of the geology of each deposit as they relate to each other,” Salamis says. “It’s the results of the efforts of the exploration team.”