Estrella Resources has dropped a bombshell maiden resource in Timor-Leste, tabling a mammoth 621-million-tonne inferred resource at its Werumata limestone project.

The deposit, 170km east-northeast of the capital Dili, is a monster by any measure and appears to offer plenty of growth, with a suite of products for every occasion.

The resource contains a huge high-grade core of 493 million tonnes of limestone suitable for sale as an acid neutralisation agent, grading an average of 83.2 per cent acid neutralisation capacity.

In addition, the company has defined a further 33 million tonnes of lower-grade limestone suitable for industrial uses such as concrete blocks and cement, along with 95 million tonnes of high-silica material ideal for road base and construction aggregate.

From a geological perspective, this looks about as straightforward as it gets. The deposit comprises two principal limestone formations, the Baucau limestone and the Batu Putih chalk. Both are broadly flat-lying and tabular, pointing towards a low-cost, open-cut mining operation.

Better still, Estrella says all three products are direct-shipping ores, meaning they require only simple crushing and screening, with no further complex and costly metallurgical processing.

The Werumata project sits within a 4990-hectare concession in the Lautém municipality and is accessible by sealed all-weather roads. Management has flagged the potential for export via coastal shipping, a crucial element for getting a bulk commodity to market.

The most compelling part of this story may still be about to unfold. The company is quick to point out that the drilling to date has tested only a small portion of the project near its western boundary. The limestone formations extend for more than 6km to the east across the concession, an area that is largely untested by the drill bit.

The maiden 621 million tonne Inferred Resource at Werumata is an exceptional starting point and confirms the project as a potentially significant large-scale limestone development. With drilling having tested only a fraction of the concession and mineralisation extending for more than six kilometres eastward, we see substantial upside to further grow the resource base.

Beyond its monster limestone resource, Estrella remains focused on bulk extraction at its Ira Miri manganese project, also in Timor-Leste.

The company recently lifted more than 27,000 tonnes of ore for market appraisal and confirmed the presence of ultra-high-grade mineralisation across the emerging project.

The successful programme delivered a premium high-grade parcel of 4984 tonnes grading 49.38 per cent manganese. While the stockpile grades are impressive, direct sampling from within the pit has been even more eye-catching. In-situ ultra-high-grade material has been confirmed at up to 60.22 per cent manganese, providing a clear indication of the project’s quality.

Estrella only kicked off its maiden drilling at the project in May last year, transitioning from a greenfields discovery to bulk extraction in little more than nine months.

With a maiden resource at Werumata tipping the scales at over 600 million tonnes, the dual commodity blue-sky potential appears vast.

It’s not often you see a maiden resource north of half a billion tonnes lobbed onto the market, particularly one with such simple geology and processing characteristics.

With a resource that is open in just about every direction and a 6km-long stretch of prospective ground screaming to be drilled, the ink is barely dry on this first estimate and Estrella appears to be already looking at a much bigger prize.

Is your ASX-listed company doing something interesting? Contact: matt.birney@wanews.com.au