Typically it's going to be an mafic/ultramafic - basalt,...

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Son of Gwalia

786 Posts.

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12/08/22

20:40

Post #: 63088410
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Originally posted by Jasongray: ↑

Nah I understand that its not 43m unbroken, most holes have multiple intercepts in the one hole, its just they never list whats inbetween.

"Wallrock alteration has been recognized a valuable tool in exploration, because the alteration haloes around many deposits, are widespread and easier to locate than the orebodies themselves. At various distances from a vein, the conditions of temperature and chemistry are usually different. As a result of this different types of alteration are likely to be produced simultaneously at various distances from the vein or fissure. For example, in the outer fringes of the alteration zone, the ferromagnesians may have been slightly hydrated while the interior zone was being silicified or sericitized, and the intermediate zone argillized. The product of this is a zoning of different alteration products arranged symmetrically around the central vein. In some deposits this zoning is conspicuous and may be an excellent guide to ore"

So im just wondering if its a good thing or not, ill ask one of the geos at work tomorrow.

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Typically it's going to be an mafic/ultramafic - basalt, amphibolite, schists. Many companies reference "greenstone" terrains, which includes all of the above. Occasionally you get metasediments surrounding the pegmatites in some deposits like Wodgina and Greenbushes.

If you dig into the JORC table at the bottom, you'll find it's the metasediments of the Burrell Group. You'll also see the pegmatite is 20-30% spodumene, but make of that what you will.

It would be extremely uncommon for pegmatites to create an alteration halo, the temperature and fluid types aren't hot enough or acidic enough. The alteration you've mentioned would be more typical for precious and base metal deposits.

Last edited by Son of Gwalia: 12/08/22

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0 Great analysis

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