Geoprof provided an intesting link a couple of days ago to a document which explains MMS and VMS deposits. MMS deposits typically include Chromite deposits, Ni/Cu deposits and PGMs. It would appear that when magma flows from its origin through a host rock, it cools down as you would expect. The Ni/Cu deposits form at a "liquid immiscibility" stage where the Ni/Cu sulphides separate out, similar to oil and water mixture with the metal compounds being the heavier. They settle to the bottom of the magmatic chamber, normally at the base of the intrusives. Chromite deposits form similarly but are end products of a separation of solid phase with the chromite compounds crystalize out and settle down.

While somewhat technical, the interesting thing is that we have both happening as well as PGMs. The formation of PGMs are more difficult to predict. It would appear that the Chromite and the Ni/Cu occur at different locations due to the stages of cooling and the makeup of the source magma. When you look at the locations of AT-12 and E1, particularly in relation to the Red LIne, they are a similar distance inside the circle. The MTX hit much further north is also a similar distance inside. AT-7, AT-8 and AT-9 are small concentrated anomalies that look very interesting to me due to their location relative to the Red Line and their similar EM signature to AT-12.

It seems probable that the Red Line is a fault or a line of weakness in the earths crust that permitted magma to flow. If this is the case, we have a lot to look forward to in the next couple of years.