$mko.v 1/8 OK Sharkheads.
Today’s thread is about sampling and dilution (key risk #3 of my pinned tweet). I have real time mining pictures below.
Punchline is tolerances are tight and dilution has been ~10%.
But data coming from just 1 or 2 benches ain’t worth schist.
Today’s thread is about sampling and dilution (key risk #3 of my pinned tweet). I have real time mining pictures below.
Punchline is tolerances are tight and dilution has been ~10%.
But data coming from just 1 or 2 benches ain’t worth schist.
$mko.v 2/8 Recap of what we’re doing.
6-8m blast holes, taking 1-1.5m samples along the way. With BH data, open up 3m half mining benches. Geologist mark contact with FW/HW with blue paint. With excavator, remove the waste up to paint. Then remove “ore” to the FW contact.
6-8m blast holes, taking 1-1.5m samples along the way. With BH data, open up 3m half mining benches. Geologist mark contact with FW/HW with blue paint. With excavator, remove the waste up to paint. Then remove “ore” to the FW contact.
$mko.v 3/8 Blast holes have 2 problems.
1. geology is not so kind to have straight 1m lines, so sample grades at contact point will be diluted.
2. RC and DH have good corr., but BH systematically underreport high grade (we have data to support this — prob. because of fines)
1. geology is not so kind to have straight 1m lines, so sample grades at contact point will be diluted.
2. RC and DH have good corr., but BH systematically underreport high grade (we have data to support this — prob. because of fines)
$mko.v 4/8 fortunately we have living breathing geologists, with real-life eye-balls!!
They are also aspiring graffiti artists!
San Al-Bansky.
They are also aspiring graffiti artists!
San Al-Bansky.
$mko.v 5/8 now we have grades from BH’s, which aren’t all that accurate.
Time to take some channel samples to take a real estimate of grade.
We’ll report these when our lab is operational.
We have a belt sampler at the crusher to have final grade reconciliation.
Time to take some channel samples to take a real estimate of grade.
We’ll report these when our lab is operational.
We have a belt sampler at the crusher to have final grade reconciliation.
$mko.v 6/8 so can we mine this? Initial evidence says HELL’S YES!!
That looks like sub 0.5m tolerances to me.
@NeilRingdahl has been a critic of ours (in the good sense of the word). Wonder what he thinks.
That looks like sub 0.5m tolerances to me.
@NeilRingdahl has been a critic of ours (in the good sense of the word). Wonder what he thinks.
$mko.v 7/8 how bout the footwall?
Pretty good. I should note, we are still in a free-dig area.
Blasting will start in June around the high grade where we get harder rock. I’d like to see how that works before declaring victory.
Pretty good. I should note, we are still in a free-dig area.
Blasting will start in June around the high grade where we get harder rock. I’d like to see how that works before declaring victory.
$mko.v 8/8 so how do you measure dilution?
We now can create a solid by surveying the blue lines every couple of meters down dip. We plug those survey points into a GPS. We then survey the post-mining bench.
🔼 is dilution.
First 2 benches were running around 10%.
/fin
We now can create a solid by surveying the blue lines every couple of meters down dip. We plug those survey points into a GPS. We then survey the post-mining bench.
🔼 is dilution.
First 2 benches were running around 10%.
/fin
