Consultant QME was appointed at the end of last year to optimise the mining plan and has suggested the mineable tonnage can be increased by using a lower cut-off grade and by adopting a revised mine development.
For example, a 2017 Scoping Study was based on mining only the 2.1mln tonnes of indicated resources and did not include a further 4.1mln tonnes of inferred resources.
Anglesay says these opitons are being assessed in the second stage of the review process, which is now underway with completion scheduled for the end of 2019.
Funds permitting, that would lead to an upgraded scoping study or a preliminary feasibility study said Anglesey.
On completion of a feasibility study QME has the option to undertake the mine's development in return for a 30% stake in the project.
John Kearney, Anglesey's chairman, said: “The 2017 Scoping Study demonstrated a viable mine development at Parys Mountain with a healthy financial rate of return.
“The outlook for metal prices, particularly zinc, copper and lead, which form the basis of Parys Mountain revenue, remains very positive.”