Key highlights

• Solstice Minerals has reported drilling results that confirm an expanding shallow high-grade zone at its Nanadie copper-gold deposit.

• The northern part of the deposit is where the expanding zone was identified, with results announced on 2 November.

• This update compares the results with the resource and covers exploration upside, market context and the next steps.

Solstice Minerals (ASX:SLS) has reported new drilling results that it says confirm an expanding shallow high-grade zone in the northern part of its Nanadie copper-gold deposit in Western Australia. The company announced the results to the ASX on 2 November.

Hole NANRC067 returned 41 metres at 2.79% copper and 0.7 g/t gold from 19 metres, including 10 metres at 9.4% copper, 2.13 g/t gold and 23.4 g/t silver. Deeper, hole NANRCD060 intersected 10.9 metres at 2.67% copper and 0.52 g/t gold from 239 metres.

How these compare with the resource

The high-grade zone sits within and below the current resource of 40.4 million tonnes. The resource grade is not included here, so the exact comparison cannot be made, but grades approaching 3% copper over 41 metres from near surface are substantially above what most bulk copper deposits average.

The company says results from continued infill and step-down drilling highlight the potential to define commercially important near-surface zones of mineralisation at grades higher than the current resource. That is a forward-looking interpretation.

Why shallow matters

The answer to the headline question rests largely on depth. Mineralisation starting at 19 metres could, in principle, be accessed early in an open-pit operation, which can improve project Economics by generating higher Revenue in the first years of mining. Higher early Cash Flow can shorten payback periods and make financing easier.

Whether that potential is realised depends on the size and continuity of the high-grade zone, its metallurgy and the overall Mining plan.

Exploration upside

Solstice says the drilling points to under-explored up-plunge positions along the eastern side of the host gabbro package. A gabbro is a coarse-grained igneous rock, and copper-gold mineralisation in such settings can be controlled by structures and contacts within the intrusion. "Up-plunge" refers to the direction in which a mineralised shoot rises towards the surface, which can be an efficient place to look for shallow extensions.

Reading the results carefully

The intervals are downhole lengths, and true widths were not stated in the summary reviewed. A single 10-metre interval grading 9.4% copper is exceptional, but high-grade zones can be irregular. Infill drilling is designed to test that continuity.

Market context

Copper Supply concerns have supported interest in near-surface copper projects in stable jurisdictions such as Western Australia, where infrastructure and services are well developed.

What comes next

Solstice is continuing infill and step-down drilling. The results are likely to feed into an updated resource estimate, although the timing was not specified in the material reviewed. Metallurgical testing will also be important, particularly given the presence of gold and silver alongside copper.

What to watch

Investors may watch for further assays from the northern zone, any resource update and the company's study plans for Nanadie.

Copper grades in context

Many of the world's large open-pit copper mines operate at average grades below 1% copper, relying on scale. Deposits with zones of several per cent copper near surface are less common and can offer a different economic profile, often with smaller but higher-margin operations. Nanadie's overall resource grade and the size of the high-grade zone will determine which model applies. The deeper intercept in NANRCD060 also shows mineralisation persisting at depth, which could matter for long-term mine life even if early mining focuses on shallow material. Investors should also note that the resource grade and classification were not available in the summary reviewed here.