URL: https://geoscience.data.qld.gov.au/dataset/cr121710
Location: EPM 15452 is located 30km SW of Dimbulah and lies next to the small township of Petford.
Commodity: The Dover castle mines on EPM 15452 have historically been a producer of Ag-Pb-Zn-Sn.
Dover Castle Metals Pty Ltd’s exploration programs have targeted Ag-Pb-Zn-Sn and In mineralization.
Geology: The Dover Castle deposits are hosted by O’Brien’s Supersuite volcanic ignimbrites of the Eight
Mile Caldera, which is strongly fractured and folded in broad open folds by a 315Myr deformation (Nethery
and Barr 1996, Nethery and Barr 1998) and intruded by O’Brien’s Creek Supersuite and Ootann Supersuite
granite batholiths.
Work done: A significant amount of exploration was completed on EPM15452 during the 2019 period,
including: An extensive geological mapping program and detailed geological report completed by Dr. Nick
Oliver of James Cook University Townsville, our maiden diamond drilling program completing more than
1,500m of diamond core, James Cook university has completed a body of work and conference talks.
Results: Drilling, Soil and Rock Chip geochemistry along with the IP survey has identified several N-S
trending anomalies across EPM15452 (coincident with historic workings), and a large, high chargeability
anomaly immediately north of this on EPM15452. Deep diamond drilling conducted in late 2019 has identified
an important discovery. The Dover Castle is a Tin Porphyry system developed within ignimbrite, being
part of the main tin and gold bearing O’Brien’s Creek Supersuite with alteration ranging from phyllic
to potassic facies (Nethery 2019).
Conclusions: Drilling to this point has identified base metal mineralization (Ag-Pb-Zn) in RC drilling
coincident with highest surface responses of lead and tin, as well as strongest chargeability and resistivity
responses from the IP survey. Deep diamond drilling conducted in late 2019 has uncovered the driving
mechanism to the mineralisation observed inside EPM15452.