A new division of the Ancient Order of Hibernians has been set up in opposition to the proposed goldmine.
The Order launched the new 'Molly Maguire Division', in Greencastle last week.
Canadian firm Dalradian Gold wants to construct a processing plant.
President of the division Martin Tracey told Q Radio they use cyanide to extract the gold.
Appeal to European Court being considered after ruling over Troubles disclosures
Executive agrees to set aside £119m for PSNI data breach payouts
Concern voiced as next phase of Omagh Bombing Inquiry hearings delayed
Four fatal house fires in three days in Northern Ireland ‘deeply concerning’
‘Much more to do’ to protect children in NI from sexual exploitation – report