Regis Resources shares closed on Friday trading for $4.47. In morning trade today, shares are swapping hands for $4.30 apiece, down 3.9%. That leaves the Regis Resources share price up 125.1% since this time last year.

For some context, the ASX 200 is down 0.6% at this same time.

Here's what's catching investor interest today.

ASX 200 gold stock slides on rising costs

Investors are bidding down the Regis Resources share price today following the release of the miner's June quarter update.

The ASX 200 gold stock reported gold production for the three months of 87,400 ounces at an all-in sustaining cost (AISC) of $2,812 an ounce. AISC in the quarter was materially higher than the $2,538/oz reported in the prior quarter.

Gold sales came in at 96,800 ounces bringing in $498 million in revenue. Regis achieved an average realised price of $5,148 an ounce, spurring operating cash flow of $260 million.

On the cost front, capital expenditure was $103 million for the quarter.

For the full FY 2025, Regis Resources produced 373,000 ounces of gold, near the high end of its guidance range. With an AISC of $2,531 per ounce, costs were in the bottom half of the miner's full-year guidance range, while rising in the June quarter.

As at 30 June, the company held cash and bullion of $517 million. That's up $222 million over the full year, and it's after the $300 million debt repayment made in January.

Commenting on the results that have yet to lift the ASX 200 gold stock today, Regis Resources CEO Jim Beyer said, "The team has delivered another strong quarter and exceeded our plans for the full 2025 financial year."

Beyer added:

This solid operational performance, combined with the supportive gold price environment, has strengthened our financial position over the year. With our FY26 guidance we expect this performance trend to continue.

Overall, Regis continues to build on its very strong position by reinvesting into both low-risk growth and opportunistic production, all the while growing balance sheet strength and long-term optionality.

What else did Regis Resources report today?

Separately, the ASX 200 gold stock announced this morning that it has agreed to acquire the Southern Star prospect from Great Southern Mining Ltd (ASX: GSN). Regis said it expects to define a project to convert mineralisation to another production source within six months.

Regis Resources will make a $4 million upfront cash payment, and contingent payments up to $5 million for the prospect.

Great Southern Mining's managing director, Matthew Keane, said: "This transaction is beneficial for both Great Southern Mining and Regis."

He added:

Regis is perfectly positioned to leverage the near-term development upside from Southern Star. It's a deal that creates immediate value and sets the stage for new discoveries in the Duketon Belt.

What's ahead for the ASX 200 gold stock?

Regis Resources also provided FY 2026 production, cost, and capital guidance.

The ASX 200 gold stock is forecasting:

• Gold production of 350koz – 380koz
• All-in sustaining costs of $2,610/oz – $2,990/oz (incl. ~$170/oz non-cash inventory adjustment)
• Growth capital of $180M – $195M
• Exploration of $50M – $60M
• McPhillamys: $10M – $20M (relating to uncertainty around a judicial review)

The post Up 125% in a year, why is this ASX 200 gold stock sinking on Monday appeared first on The Motley Fool Australia.

Great Southern Mining is a mineral exploration company with a focus on gold. It has landholdings in the gold districts of Laverton in Western Australia and the Mt Carlton region of North Queensland.

What did Great Southern Mining announce?

This morning, Great Southern Mining revealed it has commenced the extensive reverse circulation (RC) and diamond drill program at its 100%-owned Cox's Find Project. 

Cox's Find is an orogenic gold deposit located in the Duketon Greenstone Belt in the Laverton District of WA. It is located within 12 kilometres of Regis Resources Limited (ASX: RRL)'s multi-million ounce Garden Well.

Limited exploration has been conducted at the Cox's Find Project since mining activities ceased in the early 1940s. The mine produced approximately 107,000 tonnes at an average grade of 22 grams per tonne (g/t) gold for 77,000 ounces.

In late 2019, Great Southern Mining completed its maiden RC drilling program at Cox's Find, comprising 17 RC holes for 2,658 metres. According to the company, results from this maiden program highlighted that the remnant high-grade gold mineralisation remains.

Standout results from this program (announced last year) include:

• 8 metres at 9.43 g/t gold from 73 metres;
• 2 metres at 36 g/t gold from 146 metres;
• 5 metres at 45.54 g/t gold from 140 metres;
• 6 metres at 7.9 g/t gold from 132 metres; and
• 5 metres at 31.23 g/t gold from 134 metres.

The commencement of the new drilling program announced today will build on these recent results.

"This will be the first intensive drill program targeting the down plunge extensions of the deposit and the first diamond drill program targeting the high-grade lode," said CEO Mark Major.

"This program should enhance our structural understanding of the deposit and assist with advancing the forthcoming drill programs at the Cox's Find deposit and support targeting repeat structures within our tenure," Mr Major added.

Great Southern Mining noted that the RC drill rig is on-site and it has commenced drilling the initial phase of the 9,000-metre drilling program. Meanwhile, the company expects the diamond drill rig to arrive on-site within a week.

At the time of writing, the Great Southern Mining share price is up 12.94% for the day to 9.6 cents. This takes the company's current market capitalisation to just under $40 million.

In other news in the gold space, large-cap ASX gold shares are charging higher today after the gold price rebounded overnight.

The post Great Southern Mining share price jumps 13% as drilling commences at Cox's Find appeared first on The Motley Fool Australia.