Greentech Technology International Ltd.'s contained tin resource at its Renison Bell underground mine, part of the Renison project in Tasmania, Australia, swelled 22%.

The mine now hosts a JORC 2012-compliant measured, indicated and inferred resource of 17.6 million tonnes at 1.50% tin containing 263,000 tonnes of tin.

The company said May 24 that contained measured and indicated resources at Renison Bell increased 93% to 228,800 tonnes of tin, and the tin resource grade climbed 14.5% to 1.50% tin.

Total resources at the Renison project, which also includes the Mount Bischoff and Rentails deposits, stand at 43.1 million tonnes at 0.87% tin containing 376,400 tonnes of tin.

The upgrade was achieved mainly on the back of an ongoing diamond core drilling, and an update of the ore reserve estimate and the life-of-mine plan is expected in the September quarter.

The mine is held by Bluestone Mines Tasmania Joint Venture Pty. Ltd., a joint venture equally owned by Greentech and Metals X Ltd.

Operations at the Renison mine were suspended in January for a few days due to a bush fire close to the site.