You finally managed to post something
slightly relevant, although of course it didn't hold water. (I thought the 'storm in a sieve' idiom was pretty good).
The best part from that article was that the garimpos manged to mine
10 tons of gold 
from Eldorado do Juma which we know bled off a
gabbro intrusion:
"Gold (at Eldorado do Juma) is typically located along the vertical joints (at least 3 mineralised joint/fracture planes were noted by Amazon Geoservices) and also along the bedding surfaces. This suggests low pressure hydrothermal mineralisation.
Strong stockwork veining is present in the Gabbro unit that is found at the base of the sediment and intercalated volcanic package. This Gabbro has been identified over 4km of strike and is highly likely the source to the hydrothermal fluids that have deposited the gold along fractures and veins in the sediments."
From
http://www.bbxminerals.com.au/wp-content/uploads/Juma_Geo_Opinion.pdf
I'm sure you'll still be around when those RC assays come in. That's gonna be an
awesome day for so many reasons.
