The explorer announced the initial results last month and said the full results now showed 0.78% copper-equivalent mineralisation for the entire length of the 387m hole, which was abandoned due to drilling difficulties.

It also included 232m from surface at 0.74% copper and 0.33g/t gold, or 1% CuEq.

"In a global context, the complete results from drill hole 18-ESP-025 compare well with drill results from peer copper deposits reported in Q1 this year; the drill hole would have ranked number three only being exceeded by two deep copper deposits," president and CEO Keith Henderson said.

He said it was important to remember Centenera's intersection was the only one in the table (below) starting from surface.

The company plans to focus its exploration efforts on Esperanza this year. It acquired an option over the property, explored about 10 years ago by Cardero Resource Corp, in January 2017.

Centenera launched a non-brokered private placement in March, designed to raise up to C$3 million (US$2.3 million) at 18c per unit for the exploration and general working capital.

Its shares closed down C1c yesterday to 15c and are down 6.25% year-to-date, capitalising it at $11 million.