The rock types at Rodruin are comprised predominantly of a series of typically carbonate altered or dolomitic metasediments, mainly greywackes and slates, and carbonate lithologies. The carbonates display sedimentary textures in places, and it is likely they are largely of sedimentary, and possibly stromatolitic origin. The clastic sediments are possibly epiclastic or volcaniclastic origin, although there is very little evidence of volcanic activity in the immediate Rodruin area. An intrusive diorite body outcrops south of Aladdin’s Hill, and massive rhyolites of undetermined origin outcrop to the northwest of Aladdin’s Hill. The sequence is cut by frequently north-south striking andesitic dykes. The sediments and carbonates were apparently deposited in a shallow, quiescent marginal environment.
The Rodruin area is structurally complex with major faulting and folding present throughout the entire prospect area. There is also clear evidence of low angle thrust faulting at Rodruin. The South Ridge is capped by massive carbonate which is located in the overthrust block. Faulting clearly truncates mineralization in places, and there is strong evidence of mineralization being associated with structures and metal enrichment, notably copper staining immediately along faults. The Spiral Pit underground workings are clearly localized along a fault structure which truncates the gossan-hosted mineralization in channel profile ROC-017, suggesting strong enrichment of gold and other metals along structures.
Due to the steep topography much of the area is covered in a thin layer of unconsolidated scree and talus, obscuring the subcrop. On the north flank of the South Ridge there is a thick layer of cemented talus and scree, several metres thick, which contains massive blocks of carbonate which has been interpreted as a mass slump unit, and potentially obscures sub-cropping mineralization.
Gold mineralization at Aladdin’s Hill is associated with a series of very phyllic altered rocks, consisting of granular quartz, mica and iron oxides, presumed to be meta-sediments. Ancient workings have been sampled to a depth of 40m below ground level, returning assays of up to 15.45 g/t Au, and drill hole ROP-003 returned assays from individual 1m samples of 221 g/t Au and 94.3 g/t Au, confirming the existence of high grade mineralization within this highly altered unit. The mineralization at Aladdin’s Hill consists of native gold, which is typically associated with supergene copper, lead, arsenic and zinc minerals. Underground samples from the Spiral Pit workings have also returned assays of up to 35 g/t Au, and a single sample from ancient workings on the North Ridge returned an assay of 321 g/t Au. Abundant coarse gold has been identified from samples taken at surface at Aladdin’s Hill. The mineralization at the Spiral Pit bears strong similarities to that seen in the high grade underground workings at Aladdin’s Hill.
Gold mineralization also occurs over a significant surface areal extent at Rodruin associated with strongly gossanous rocks, and often carries significant zinc values. This style of mineralization takes the form of zinc- and gold-rich dark brown, red brown and almost black gossans formed in both the carbonate and slate rock types and more particularly close to the contact between the two. The mineralization within these gossans tend to be rich in zinc (>30% in places) but poor in copper and lead relative to the phyllic hosted mineralization at Aladdin’s Hill.