Wedoany.com Report on Mar 4th, Viking Mines Limited (ASX:VKA) has achieved positive progress at its Linka tungsten project in Nevada, USA, with preliminary gravity separation tests resulting in a significant 16-fold increase in tungsten grade.

The tests were conducted on samples collected from the historical Linka mine pit, which had a grade of 1.4% WO3. Using gravity processing methods, a recovery rate of up to 63.7% was achieved, producing an initial coarse concentrate with a grade of 22.9% WO3. Gravity separation leverages the high density of scheelite for mechanical separation, eliminating the need for expensive chemical reagents and offering a cost-effective option.

Managing Director and CEO Julian Woodcock stated, "This is an excellent outcome, achieving a 16-fold increase in scheelite concentrate grade to 22.9% WO3 using the simplest and most inexpensive processing method." The company plans to conduct further validation tests on additional samples to optimize the process flow.

Viking Mines has initiated more advanced gravity separation optimization tests, including staged grinding methods, which are expected to further improve both grade and recovery rates. The company is also in discussions with processing specialist Mineral Technologies to evaluate modular gravity processing equipment as a fast-track option for the Linka project.

Tungsten, a critical strategic metal, faces tight supply in the United States, with 50% dependency on imports, and is classified as a critical mineral by the U.S. Geological Survey. Tungsten prices remain high, with ammonium paratungstate reaching USD 1,850 per metric tonne unit (10kg) in Rotterdam. Viking Mines aims to accelerate the development of the Linka project to leverage the high prices and U.S. policy support, helping to alleviate supply constraints.

Woodcock added, "We are accelerating process flow development to assess low-cost modular solutions." The company is advancing the project towards the production stage to capitalize on market opportunities.