RNS - MJ Tailings Production1 Apr 2021 10:26
WOW what an RNS! Lab results on MJ tailings samples are back ... to recap what we now know:
> Gravity separation most cost effective & recoveries in excess of 50% gold and 40% silver
> Recoveries of up to 140g/t gold and 20,000 g/t silver stated
> MJ Tailings of 12kt available for extraction
This is a Gob-Smacking HUGE improvement on prior RNS @15-Oct-2020 stating bench test gravity recovery of 30% gold and 15% silver plus expected grade from MJ tailings at 2.28g/t gold and 658g/t silver.
The RNS also confirmed that Heap leach NOT being pursued now due to the costs, but IMHO could easily be added later as post-processing especially when new ore comes onstream following drilling campaigns now underway. For comparison RNS @15-Oct-2020 confirmed 48-hour bench test for cyanide leach recovery at 87% gold and 46% silver.
Bonanza Grade Definition:
The World Gold Council defines a high-quality underground mine as having a gold ore density between 8 and 10 g/t (grams per ton), while a low-quality underground mine has a gold ore density of 1 to 4 g/t. Some view bonanza-grade as more than 34 grams of gold per tonne or more than one troy ounce of gold per ton.
For comparison a high-quality open pit gold mine of 1.5g/t gold is considered high quality. Tailings are about as 'open-pit' equivalent as you can get but easier as you just dig them up off the ground and load them.
Commentary:
I'd love to rerun my small-scale tailing production calculations, but frankly the tailings grade quoted is just too fantastic to be believable, don't get me wrong I REALLY want to believe it but it is Super, Uber-Bonanza grade from tailings. Put it another way at 60:1 Silver/Gold ratio the silver is 330g/t gold equivalent plus 140g/t = 470g/t Gold. IF that were true the 12Kt tailings would contain approx. 180Koz Gold Equivalent Ounces and if we assumed ridiculously high start-up AISC of $1,350 vs $1,700 sale price would generate $350 profit/ounce or $63m/£45.7m free cashflow (profit). These figures are incompatible with GWMOs "Heap Leach is uneconomic statement" as quite frankly I would heap leach the heck out it (probably twice for good measure!) for another 37% gold recovery alone if 50% recovery =140g/t then another 37% = plus 103g/t !
Brian Hall, something does not add up here. Clarification is urgently required, today would be good.
There are businesses Jubilee and PAF making money reprocessing old tailings for less than 1g/t recovery.
Someone PLEASE tell me I have misunderstood something and correct me if I missed something?! I know it is 1st April but this is an RNS Brian.
Clearly AIMHO & DYOR APR