Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Gold/Mining/Energy : ECHARTERS -- Ignore unavailable to you. Want to Upgrade?

To: mark warburton who wrote (3069)	2/25/1999 11:58:00 AM
From: E. Charters	Read Replies (2) \| Respond to of 3744

It depends on who you believe. Hemlo was in a synform with a barite layer. This is not that unusual as sulfates often form in volcanic areas. U of T geologists analysed Hemlo to be a high grade, curvy narrow, mylonite or shear zone within a larger deformation area. Its wide zonation and even grade is a myth. In fact it is extremely nuggety and Noranda feared after all their drill holes that it might not hold grade. The assay lab had to grind up all the core and bulk cyanide it to do a grade determination for the company. Hemlo's structure was related to a large synclinal fold and was the axial planar zone of a scale commensurate with that scale of fold. The strike length of the 3 zones was about one mile. Hemlo was closely associate with Quart-Felspar Porphyry which was iniquitous in the area. It was also classically close to a granite pluton. Few of the 100's of parallel mapped porphyries in Secours, Bomber and Fradre Townships were later explored, although I believe this was the most important control. The flavour of the month companies seemed to think that IP on strike was the way to go. So far this has not been productive. There are all sorts of veins associated with folds. Axial planar shears hold in-line lenses of various sorts. Sometimes pods exist draped on the side of fold limbs. Often at different scales tension fracture veins can cross cut the folded beds at high angles to the shears. Axial planar veins can be offset uniformly by later folding. Dilations between beds can contain folded veins (saddle reef). Sometimes zones will contain whole sets of tension fracture from inch sizes to several feet. Sometimes the whole mine will be inside one large tension fracture crossing a regional fold (Manitoba, Snow Lake). So scale and structure together work to change the geometry of mine veins to many odd shapes and directions. And you have to look in 3 dimensions to as the veins can be displaced laterally along strike, across strike, or folded away laterally or in the strike direction. All the veins I have seen in Beardmore are of the folded saddle reef type with a shallow westerly plunge. East plunges I have seen on a couple of properties but they are rare. I have not seen axial planar. shears that contain significant gold. (These shears are the axis of the fold itself and cut directly through the nose..) Most of the shearing I have seen is mildly crosscutting of beds, so is axial planar but seems to be restricted to folded tuff or diorite beds (Dik Dik, Brookbank) and stops "close" to the nose of the small scale folds. In general it is restricted to the less competent slaty beds that follow the general folding. Gold is at the nose of the quartz veins in sheared host rock and the larger seemingly bull quartz veins yield better grade than the small ones. Much of the rusty shear will pan gold in Beardmore although its quartz is often "invisible". The shears will contain quartz on close inspection but initially will fool you. Without folding in the immediate area the Beardmore, Jellico, Long Lac veins do not appear to be productive. I have reservations that the Brookbank is in fact pure shear zone type. There is no guarantee that it is not but it would have to be one in a 100. Since the ore conduits are along the hinge line and that hinge has a pronounced plunge, the likelihood is that any zone will follow that plunge too. The Brookbank could be the intersection of two opposite plunging zones as the Hardrock was. This would give you more area of lateral mineralization at certain depths where the structures meet. This "S" to "Z" folding is seen here and there, and I had staked one such property as an analog to the Hardrock. I had seen it too west of the property about 2 miles on another auriferous zone. Grades sometimes are higher in the double-plungers and I have some evidence of that. The Hardrock and the Brookbank were about 0.50 ounces grade. Notice however that I said "could be".. EC<:-} mineletter.com

To: mark warburton who wrote (3069)	3/30/1999 2:59:00 AM
From: E. Charters	Read Replies (2) \| Respond to of 3744

I once saw the Empire vein stripped on the surface in Beardmore. (1984) It was about 800 feet long and 4 to 8 feet wide. The S fold noses blew out to about 15 feet in places every 50 to 75 feet along the vein which was a simple and very persistent quartz vein ore with about 3 to 5% sulphides. It was supposed to run about 0.60 ounce ore for 40% of its length. Now that I recall it could have been mined as a tabular vein and in looking at the plans and long sections of the stopes at the Empire that is exactly how they blocked out their ore. The Sand River too. It was about 700 feet of continuous 0.50 ounces per ton and 3 feet wide. It was mined by resuing and made money. The Empire veins could be shrunk and may be able to hold 1/2 ounce. The company then would not mine it as they did not underground work. So it may be possible that the western deposits in this belt may hold blockable ore that can be tabular and continuous. The Empire had an impressive strike length and was far from being solely plunging saddles as the Mcleod was. EC<:-}