Greatland Resources (ASX:GGP) said its combined mineral resource estimate (MRE) for its Telfer gold-copper project in Western Australia grew 150%, or 4.8 million ounces, to a total of 8 million ounces of gold, according to a Monday Australian bourse filing.

Telfer and Havieron gold-copper projects' MRE now stand at 14.9 million ounces of gold and 645,000 tonnes of copper, including 550 million tonnes at 0.84 grams per tonne gold and 0.12% copper.

The company said Telfer's organic MRE growth was delivered at a discovery cost of AU$5 per ounce, with measured and indicated resource growth of 163%.

Following significant resource growth, particularly in the measured and indicated category, the company said its focus now shifts to advancing higher-grade opportunities, including Telfer's Main Dome Underground and the West Dome Underground sublevel cave area.

The company plans to drill 100,000 meters for the second half of fiscal year 2026, with a substantial drilling program also expected for fiscal year 2027.

The company's shares rose 9% in recent Monday trade.