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

To: E. Charters who wrote (11190)	5/12/2006 3:50:19 PM
From: hubris33	Read Replies (1) \| Respond to of 78417

What? There is a hole in the Great Oz's wealth of knowledge? <g> Geez, what next? I suppose the ruby slippers won't work either? There's no place like Kansas. There's no place like Kansas..... H3 [Humour cap setting: G3t$7^fD]

To: E. Charters who wrote (11190)	5/12/2006 4:00:06 PM
From: ogi	Read Replies (2) \| Respond to of 78417

They are "ultra", not plain mafic! So greater mineral content. Ferromagnessian? The true import of its existence, as reported, I am not cognizant of. Cheers, Ogi

To: E. Charters who wrote (11190)	5/12/2006 4:20:48 PM
From: LoneClone	Read Replies (1) \| Respond to of 78417

I can only reply non-geologically, by quoting from the PR: "[WLF] is pleased to announce that drilling at its Marathon-McNeely Property located in the Red Lake Mining District, Ontario has intersected geological structures and units, not dissimilar to those found at the Campbell and Red Lake Mines." Since something is either similar or dissimilar in my books, I'm taking not dissimilar to mean similar, and when the geology is similar to the adjacent gold mine, that sounds to me like a good thing. I await, of course, the final pronouncement from EC once he unleashes his brain and research skills on the problem. I'm also looking forward to the assay results from the rest of their claims in the area. If they are good, this should be the precursor to the spinoff of WLF's gold properties. LC

To: E. Charters who wrote (11190)	5/13/2006 10:32:58 AM
From: peter snowdon	Respond to of 78417

Economic importance The economic importance of cumulate rocks is best represented by two classes of mineral deposits found in ultramafic to mafic layered intrusions. * Oxide mineral cumulates * Sulfide melt cumulates [edit] Oxide mineral cumulates Oxide mineral cumulates form in layered intrusions when fractional crystallisation has progressed enough to allow the crystallisation of oxide minerals which are invariably a form of spinel. This can happen due to fractional enrichment of the melt in iron, titanium or chromium. These conditions are created by the high-temperature fractionation of highly magnesian olivine and/or pyroxene, which causes a relative iron-enrichment in the residual melt. Then the iron content of the melt is sufficiently high enough, magnetite or ilmenite crystallise and, due to their high density, form cumulate rocks. Chromite is generally formed during pyroxene fractionation at low pressures, where chromium is rejected from the pyroxene crystals. These oxide layers form laterally continuous deposits of rocks containing in excess of 50% oxide minerals. When oxide minerals exceed 90% of the bulk of the interval the rock may be classified according to the oxide mineral, for example magnetitite, ilmenitite or chromitite. Strictly speaking, these would be magnetite orthocumulate, ilmenite orthocumulate and chromite orthocumulates. [edit] Sulfide mineral segregations Sulfide mineral cumulates in layered intrusions are an important source of nickel, copper, platinum group elements and cobalt. These deposits are formed by melt immiscibility between sulfide and silicate melts in a sulfur-saturated magma. They are not strictly a cumulate rock, as the sulfide is not precipitated as a solid mineral, but rather as immiscible sulfide liquid. However, they are formed by the same processes and accumulate due to their high specific gravity, and can form laterally extensive sulfide 'reefs'. The sulfide minerals generally form an interstitial matrix to a silicate cumulate. Sulfide mineral segregations can only be formed when a magma attains sulfur saturation. In mafic and ultramafic rocks they form economic Ni, Cu and PGe deposits because these elements are chalcophile and are strongly partitioned into the sulfide melt. In rare cases, felsic rocks become sulfur saturated and form sulfide segregations. In this case, the typical result is a disseminated form of sulfide mineral, usually a mixture of pyrrhotite, pyrite and chalcopyrite, forming Cu mineralisation. It is very rare but not unknown to see cumulate sulfide rocks in granitic intrusions. en.wikipedia.org