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In mining, stripping ratio or strip ratio refers to the ratio of the volume of overburden (or waste material) required to be handled in order to extract some tonnage of ore. For example, a 3:1 stripping ratio means that mining one tonne of ore will require mining three tonnes of waste rock. Stripping ratios are typically reduced to show the volume of waste removal required to extract one unit ton of ore, for example, 1.5:1 as opposed to 3:2.
When compared to surface mining, which requires overburden removal prior to ore extraction, underground mining operations tend to have lower stripping ratios due to increased selectivity.
All other factors being equal, mining at a higher stripping ratio is less profitable than mining at a lower stripping ratio because more waste must be moved (at a cost per unit volume) for an equivalent volume of revenue generating ore. If the ratio is too high given a particular price of ore and associated cost of mining then it may not be economical to conduct mining.
Brand new, still in the box black Aero Precision M5 (AR308) stripped lower. I bought a few thinking I’ll use them all, but that wasn’t the case.
Trying to fund another purchase so not open to trades, sorry. I’d prefer to meet at Tropics Pawn on 4th plain, but I’m flexible there. Buyer pays...
This Aero Precision M4E1 stripped lower is one of my spares. It has only been assembled then disassembled. Pretty much brand new.
Looking to get $85 cash
Meet up at Brads Guns in Lake Tapps
buyer pays for transfer
Aero M4E1 stripped lower (new in box) - $80
2 sets of magpul MBUS (black & FDE) - $50 each
Aero precision ultralight 30mm FDE scope mount - $60
P80 PF940 black (new in box) - $120
More Pics upon request, all new condition except minor scratches on the scope mount (shown in picture)
I have three of these receivers. All brand new, still in the packaging. Not looking for any trades. Receivers are already at my FFL in Oregon City. Once a deal has been made, you will set everything up with the FFL. Price does not include transfer fee. Can accept payment in...
WTS a White Label Armory ambi lower AR15 and different brand upper receiver. Never assembled and brand new. I had plans for the set and ended up going a different route.
Asking $300 for the set or $200 for the just the lower.
Geissele DDC stripped lower, new in box, NOT a blemula, this one is their premium grade.
$225 cash, no trades, transfer in Oregon city at buyers expense.
I can ship to FFL’s that accept from private party for arounnd $12
I have a new and unfired Knights Armament non-ambi stripped lower receiver I no longer need. It has never been fired, but it was partially built and mocked up with an upper receiver. This is not one of the blemished batches. It comes with the original box. I'm asking $500 FTF in the Portland...
Used FM Products 9mm Glock lower receiver.
Last round hold open was modified to work with Taccom Extreme Feed barrel.
TRANSFER AT LUCKY SPORTING GOODS ($20 total transfer and BGC)
BUYER PAYS TRANSFER FEES ($20)
BUYER PAYS SELLER BEFORE 4473
Thanks for looking...