The Tillworth Central occurrence is located on a small creek flowing north into the southwest arm of Slim Creek, at an elevation of approximately 2100 metres.

The area is underlain by biotite-hornblende-quartz-diorite of the Hurley River Pluton, which is assigned to the Late Cretaceous Scuzzy Plutonic Suite of the Coast Batholith. This is near the western edge of the Miocene Bridge River Pluton.

Mineralization at the Tillworth Central occurrence and along the Tillworth trend includes 3 to 100 centimetre lenticular quartz veins and stringers with clots and blebs of chalcopyrite, pyrite and malachite ±azurite ±bornite ±molybdenite. The Tillworth trend extends for approximately 13 kilometres.

In 2012, 10 rock chip samples assayed from 0.1 to 4.07 per cent copper, 0.022 to 1.455 grams per tonne gold and up to 48.7 grams per tonne silver (Assessment Report 33341).

In 2010, Miocene Metals Inc. optioned the property and completed 1227 line-kilometres of combined airborne magnetic and gamma ray spectrometer surveys over area. The following year, a minor rock sampling program was completed.

In 2012, Miocene Metals Inc. expanded the Mackenzie property from 36.3 square kilometres to 299.03 square kilometres, and followed the expansion with a program of geochemical sampling and a two-hole drill program. Sampling to the west led to the discovery of the Bornite trend; sampling to the north led to the discovery of the Tillworth trend, extending approximately 13 kilometres and sampling to the north east identified the Breccia trend. Together with the original discovery and Mackenzie (MINFILE 092JW 043) occurrences these define a zone of mineralization that extends approximately 12 kilometres outwards from the contact of the Miocene Bridge River Pluton. The drill program focused on the Mackenzie showing.