Black said drill-hole AK-18-010 which hit 327.35m of 0.91% copper, 0.44g/t gold and 9.84g/t silver (1.31% copper-equivalent) from 293m depth was a good example "of the type of holes that we were hoping to encounter in this program".

The lengthy intercept, which included 65.22m of 1.86% copper, 1.03g/t gold and 21.95g/t silver (2.8% copper-eq) from 310m, spanned both the overlying high-sulphidation zone and underlying skarn.

"When we can report intercepts of more than 100m of 1-plus-percent copper with significant gold and silver and low arsenic contents, we know we are well on our way to uncovering a new well-mineralised skarn/porphyry deposit under the high-sulphidation epithermal zone which is also returning long intercepts of high-grade mineralisation," Black said.

"The drill program remains on schedule to allow us to deliver an updated interim resource estimate by the end of this year and we look forward to reporting additional drill results soon."

AK-18-010 returned one of three 100m-plus, 1%-or-more copper-equivalent intersections in the latest release of results.

Regulus (TSXV: REG) is collaborating with Compañía Minera Coimolache SA (CMC), owner of the Tantahuatay gold mine immediately south of AntaKori, on the current drilling.

Black said AntaKori, in northern Peru, had two main copper-gold-silver sulphide mineralisation styles: the skarn and breccias in Cretaceous calcareous sedimentary rocks, "likely associated with as-yet undiscovered porphyry mineralisation, and younger, epithermal high-sulphidation mineralisation in overlying Miocene volcanic rocks and breccias.

The latter host the Tantahuatay deposit.

Regulus started the current phase one drilling on the southernmost margin of its concessions and plans to move north into its 100%-owned concessions next.

"The initial holes have encountered the overlying Miocene volcanic rocks and high-sulphidation style mineralisation prior to entering into the Cretaceous sedimentary sequence and skarn at depth," it said.

"As the drilling progresses to the north, the volcanic rocks terminate, and drill holes will commence directly in the skarn/porphyry environment within the Cretaceous sedimentary sequence."

Regulus previously reported a NI 43-101 inferred mineral resource of 294.8 million tonnes grading 0.48% copper, 0.36g/t gold and 10.2g/t silver for AntaKori.