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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.
Cleaning out some more stuff from the safe. This is one of the limited offerings from KAC a few years ago when they sold non-ambi stripped lowers. They have been fetching a nice premium and i have already built a few guns on them, this being the last one.
Would like $550 for it.
Will meet at...
Looking to stack up some silver, so I am trading AR lowers, pistols, rifles, NFA stuff, etc.
Send me a text or message of what you have available and what you are looking for. :)
All sizes of silver(and gold)
Trade me. :)
Both of these have just been sitting in the safe since I got them. Both are NIB. Upper comes with the Colt box and manual.
Upper is stripped, in that it does not include a BCG or CH. Lower is stripped.
- Upper has been Sold Separately
- Stripped Lower is SPF
Stripped lower available for...
Big ask, but: I have a very green to firearms buddy (just getting into firearms), he’s purchased his first conceal carry pistol and now just got his first AR kit yesterday.
Im seeking an affordable stripped lower or even the nearest FFL that may have one. Having a hard time locating one...
I have a complete black Radian 223 wylde 10.5 inch Radian Model 1 upper receiver. It has had about 300 rounds through it suppressed. Comes with the original BCG and SD charging handle. It has the Dead Air flash hider on it.
Also a new in the box is a black Radian AX556 A-DAC Stripped lower...
Looking to buy two Zev Technology forged stripped lowers and one stripped upper . Replacing some rifles that were stolen from me in November. Willing to pay up to $300 for the receiver. Preferrably pay less.
Already sold on the upper and one lower. Just need one more lower.
Hello, looking to sell two new in wrapper West Coast Armory branded lower receivers. They are consecutive serial numbers in case you wanted to buy both of them. Purchased to build out but have gone a different direction. Will need to transfer through FFL preferably in King County.
I have several hundred rounds of Herter's 9mm 115gr FMJ ammo, brand new in sealed boxes of 100.
I'm looking for a stripped lower receiver for an AR-15. Number of rounds depends on quality of receiver, but I'll be generous.
Also interested in 6.5 Grendel barrels, BCGs, uppers, and ammo. Open to...
I have a new in package Anderson stripped AR lower receiver I would like to trade for a 1000ct brick of US made small rifle primers. FTF at Tigard Pawn 4 More. No shipping. Trader is responsible for all transfer fees. PM me with any questions or offers.
For sale is a brand new Knight's Armament SR-15 Non-ambi blemished stripped lower receiver. Purchased from Rooftopdefense. These are discontinued and no longer for sale through Knight's Armament.
Asking $300 buyer pays for transfer fee. Meetups will be at a FFL around Seattle/Tacoma area of my...
Looking for an ambi lower. Part number APAR501102AC either black or FDE is fine.
I am flexible on the FFL used for the transfer. If you have a preference and then can give a break on the cost, sounds good to me.
I am expecting a shipment of Anderson stripped AR-15 lowers in approximately 3-5 weeks (dates not guaranteed). They will be $60 each for 1-2 or $55 each for 3+. Plus $10 background check. Oregon residents 21+ only.
I am also expecting Anderson stripped AR-15 upper receivers. They will be $55...
I just received a new shipment of Anderson AR-15 stripped lower receivers. $57 each plus $10 background check. Oregon residents 21+ only.
I also have AR15 lower parts kits, buffer tube kits, stocks, magazines, etc. available.
Explanation thread for this donation sale: https://www.northwestfirearms.com/threads/three-day-classified-sale-jan-29th-30th-and-31st-10-of-all-sales-will-be-donated-to-nwfa.354654/#post-2816218
Link to all my listings...