Thursday, June 20, 2013

Processed to 5696 feet, secondary mineral slickensides or slickenfibres

Today we boxed rock core to a depth of 5696 ft, 70 ft deeper than yesterday.  The drillers actually drilled 90 ft of core, but not all of it was brought down to us because of some of the activity related to wrapping up the drilling.  Tonight will be the end of the first phase of drilling this hole, I'll post the stopping depth tomorrow.  Meanwhile, here's another picture of a new and interesting feature we saw in the core today:
Here Bryan is holding a piece of core (diameter 2.625") that has green to white mineralizations on a fracture surface.  These minerals look just like the majority of the secondary material we're seeing in core vesicles and fractures, except that here they're striated in one direction.  Considering how much of this secondary mineralization we've seen in the deeper reaches of the hole, it's surprising that we haven't seen this kind of feature until today (when we saw two examples of this).  The composition of this material is certainly different from the slickensides/slickenfibres we saw shallower in the hole, but the process that formed all of them is probably the same.

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