ShebaGeology and Historical Background
In order to make it simpler to relate the various criteria (geology, geophysics, drilling etc) within the Sheba Property, I have split the property into three blocks, Sheba North Block, Sheba Central Block and the Sheba South Block. I have also tried to cover these criteria on a yearly basis, when the reports were written and when the geology maps were released, from oldest to the present.
In 1921, D.G.H. Wright mapped a portion of the Sheba North Block (Map 51d) near the Michie Twp/Robertson Twp border on RT Mineral's property. He mapped it as a banded hornblende schist and a schistose feldspar porphyry. There are also a few north-south diabase dykes. Surrounding these rocks are a lot of granite.
At the south end of the Sheba Property, within the Sheba South Block, in Alma Twp., the rocks were mapped in 1963 as basalt, and andesite porphyry (Map 2109). There are also a few north-south diabase dykes.
Map 2046 shows a generally reconnaissance mapping in the region of the Sheba Property. From the Sheba North Block to the Sheba South Block, the rock types have been described as being interflow sedimentary rocks, gabbro and diorite, andesite, basalt, basic pyroclastic rocks, and acid intrusive rocks. This map is definitely a reconnaissance map.
In August of 1991, Aerodat Limited flew an airborne EM, Magnetic and VLF survey for Larry Gervais (and M. Guiho?) over a part of Michie Township, that covered a portion of RT Mineral's Sheba North Block (42A07SW8402/42A07SW8402. The magnetic total field shows a north-south trend that exhibits moderate intensity near the Miche-Robertson township boundary. The trend then appears to be faulted off to the east. The magnetic anomaly looks as though it has a slight easterly dip.
Within the west central region of the Sheba North Block, there is a long curved VLF conductor that may be a reflection of either a shear zone, or a mineralized contact between 2 rock types. There is not enough geological information to make a definite call on this 'interpretation'. On the other hand, the VLF conductor also tends to correlate with the western edge of an Apparent Resistivity anomaly that suggests that the VLF conductor may be due to an 'edge effect' to a flat lying conductive source (clay?). The positive 4600Hz coaxial EM profiles seem to confirm this as well. There were no bonafide bedrock conductors intercepted within this portion of the Aerodat airborne survey over RT Mineral's Sheba North Block. The negative EM profiles are related to relative concentrations of magnetite.
A report by Ken Guy (42A02NE0016/42A02NE0016), who was doing some work to the west in Robertson Twp. in 1991, had a map (Figure 3) that showed a favourable mafic/felsic volcanic contact. This contact further to the west has a VMS discovery by Queenston Mining/ Total Energold Corp. This contact also extends into RT Mineral's property near the west boundary of the Sheba Central Block. It also has a 2 channel INPUT anomaly situated on the contact. As weak as the anomaly is, this conductor should be investigated in the field. I thought this info was interesting!!
As a follow-up to the Aerodat airborne survey, in 1991 M. Guiho carried out a prospecting and outcrop sampling program over his property (42A11SW8393/42A11SW8393), which covers the same area as the airborne survey, and that portion of RT Mineral's Sheba North Block. One sample, Sample 3, which is just to the north of the Sheba North Block, was interpreted as a gabbro, a medium grained black rock with some gossan stain, 1-2% fine disseminated pyrite, weakly magnetic - pink mineral in this sample locally (K-Feldspar 1/2-1%). Samples 4 and 5 were called medium grained diabase. However, they could be gabbro. It will be noted that only one traverse line was prospected within the Sheba North Block, so there is a much larger area that wasn't touched. Sample 4 appears to be located east of a potential diabase dyke, on a magnetic anomaly, but this should be verified in the field.