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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: ogi who wrote (61462)	10/7/2008 10:19:31 AM
From: E. Charters	Read Replies (1) \| Respond to of 78421

Well I am not going to bet the farm, but keep an eye on Rosebud and their other thingies. I don't share the opinion that their management is deluded or flaky. The Rosebud may be structurally shifted (there is some evidence of that) or geochemically/precipitatively lensed out, or may be lensoidal vertically, and needs further probing. Many Arizona and Nevada deposits drop in grade at shallow depths, in that they are formed from descending meteoric solutions as Goldstrike NV was, but in some cases that drop is not that serious or that shallow, as in Goldstrike's case. Rosebud, not to be confused with the Rosebud mine in another state, has lateral shifting in two intersecting planes. However it has silver as high in grams as gold, and whenever I have seen that it ends up being a deposit that variously lenses geochemically between 300 and 1600 feet in depth. I know of three instances of that in Ontario, One the La Roche long Lac and the other two escape my mind at the time although one was in Timmins and the other near Sandy Lake. Perhaps faulting or geochemistry is the reason for the deeper drills holes having lower grade. The other reason that is equally likely is that the gold is just very nuggety. So to recap we have faulting (lateral or stair step), geochem, lensing or pinching, or erratic distribution as causes of the 3 or so holes "missing" that were below 350 feet. On the other hand the holes while they hit some sort of zone, did not reveal that it was not some parallel structure, and not in the exact horizon. Parallelism is seen there, so you have to be careful. I have seen Y folding displace orebodies over 300 feet at a certain depth. Stair step structures that may be either horizontal displacement or vertical plane, could extend the lateral shift of an ore as far as you go deep. Hell, fault shifts of one mile are not unheard of. Poking around at 25 to 100 foot offsets may be productive most of the time though. Their best bet it is to laterally test the "mile long horizon" with a desultory hole or two drilled well past the ore zone at depth, perhaps as much as 300 feet laterally, but to concentrate with a much closer pattern stepping out from the numerous adits on the hillside. They should use H core and split it in short lengths in the ore zones, splitting it down to 60 to 80 gram sample sizes by careful reduction of half the core to 200 mesh, and splitting and rolling into a Jones riffle until they reach that approximate size. Acme Analytical in Vancouver specializes in these sort of sample weights in fire assay and special handling and is a very reliable lab now for many years. (No standard one pounders and spooning out of the top of the bag to exact weights. That latter assay lab technique is far too hit and miss with these type of orebodies.) In addition they should channel across the drifts and adits with diamond saw cuts and do the same system on multiple in line 2 foot runs, every 3 feet down the drift. Their estimate of a 640,000 ton potential of 0.60 OPT over the entire strike is probably good. I don't agree that a forest of BQ holes is any better, less expensive or has a better chance of finding the gold distribution and grade for the dollar. EC<:-}