The DKD 4 showing is located 1.6 kilometres south of Arlington Lakes, and approximately 12.3 kilometres north-northeast of Carmi.
The showing occurs in quartz diorite of a Middle Jurassic intrusion which is in contact with an altered gneissic diorite. This intrusion was previously mapped as Middle Jurassic Nelson Intrusions (Geological Survey of Canada Map 1736A). The altered diorite is strongly chloritized, silicified and, in some spots, serpentinized.
The DKD 4 showing consists of a northwest-southeast trending, steeply dipping, narrow shear zone in a railway rock cut. Copper mineralization consists of chalcopyrite with abundant iron oxides, specular hematite, epidote, chlorite, and biotite. Malachite staining is also noted.
The general area has numerous old workings, pits and adits which date from the early 1900s. Recent work includes a 1971 magnetometer survey for Hudson's Bay Oil and Gas Ltd. and in 1973, prospecting and geological mapping was carried out for K.F. Brunning. Some additional prospecting was carried out in 1987 by James McLeod for Edward Carson & Associates.
The 1971 magnetometer survey identified a magnetic anomaly along the geological contact between a gneissic diorite and a mafic diorite It was noted that copper mineralization is coincident with this magnetic anomaly.
In 1996, Madman Mining Co. Ltd. completed a prospecting, soil sampling, and a VLF-EM geophysical survey on the property containing the occurrence.
In 2015, Explorex Resources Inc completed magnetic and VLF-EM geophysical surveys, a prospecting and sampling program on the property containing the occurrence.
In 2017, Coast Mountain Geological Ltd. completed an exploration program including soil sampling, rock sampling, and 26.4 line-kilometres of ground magnetic and VLF-EM surveys.
In 2018, Clarmin Exploration Inc. completed a prospecting and soil sampling program on the Arlington property (Assessment Report 36956). The property was returned to Explorex Resources Inc. in late 2018.
Similar mineral occurrences in this area are the DKD 2 (082ENW041) and the BRU 21 (082ENW042).
