geology

Gold mineralisation is hosted by rocks of the Harlech Dome.   This is the main geological feature in the region and is represented by a thick succession of mainly marine Cambrian and Ordovician sediments and igneous rocks.  Sediments were deposited in this part of the Welsh Basin during the Cambrian to Silurian periods and, from the middle Silurian onwards, the Acadian Orogeny resulted in uplift, deformation and the formation of the Harlech Dome. Gold-bearing fluids are thought to have been generated at this time.

Most gold mineralisation along the Dolgellau Gold Belt is in the form of coarse free-gold hosted by narrow mesothermal or orogenic quartz-dominated veins. This type of gold mineralisation displays an extreme nugget effect.  Most gold is localised in small pockets that can exhibit extremely high or bonanza gold grades of 10s or 100s oz/t gold.  These systems are associated with arenite-mudstone turbidite sequences and there is a particularly close relationship between mineralisation and carbonaceous shales such as the Clogau Formation. The presence of igneous dykes and certain structural settings are also key controls in the formation of high-grade ore shoots.

The geology of the Gwynedd region is complex and has been the subject of a number of very well-researched reports. However, this is the first time that the entire gold belt is being thoroughly investigated.

Initially, GMOW’s objective will be to undertake detailed underground structural mapping and sampling to modernise the geological interpretation of the Project. Thereafter, GMOW intends to consider the commissioning of an airborne magnetic and electromagnetic (EM) survey over the most prospective areas of the Project, being the near-mine and other regional target areas.   The objective will be to detect deeper targets at and around the Clogau Gold Mine itself which have never been drilled or mined, as well to identify significant structures within the wider exploration ground for follow-up drilling.