Sporting Systems
Bear Creek Arsenal
Oregon Rifleworks
HighLine Firearms
Southwest Firearms
J&B Firearm Sales
JavaScript is disabled
Our website requires JavaScript to function properly. For a better experience, please enable JavaScript in your browser settings before proceeding.

  • Join the #1 community for gun owners of the Northwest

    We believe the 2nd Amendment is best defended through grass-roots organization, education, and advocacy centered around individual gun owners. It is our mission to encourage, organize, and support these efforts throughout Oregon, Washington, Idaho, Montana, and Wyoming.

    Free Membership Benefits

    • Fewer banner ads
    • Buy, sell, and trade in our classified section
    • Discuss firearms and all aspects of firearm ownership
    • Join others in organizing against anti-gun legislation
    • Find nearby gun shops, ranges, training, and other resources
    • Discover free outdoor shooting areas
    • Stay up to date on firearm-related events
    • Share photos and video with other members
    • ...and much more!

stripped lower

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.

View More On Wikipedia.org
Recent contents
  1. B

    Unopened Anderson Stripped Lower Receiver

      1. For Sale
    • $40
    • Springfield
    • Oregon
    Never opened stripped Anderson AR-15 lower receiver. Open trigger. $40
  2. arakboss

    Palmetto State Armory PA10 Stripped Lower (Blem). $80 plus shipping.

    https://palmettostatearmory.com/blem-gen3-pa10-stripped-lower-receiver.html
  3. arakboss

    Aero M4E1 Stripped Lower Receiver $70 plus shipping. Free shipping on $175+ orders.

    https://ar15discounts.com/products/aero-precision-m4e1-stripped-lower-receiver-anodized-black/ Shipping only $8.99 flat rate.
  4. arakboss

    Anderson Stripped Lower $35

      1. For Sale
    • $35
    • Wilsonville
    • Oregon
    I am selling a like new in package Anderson Stripped lower for $35. Transfer must occur at Tigard Pawn 4 More on Saturday June 10th. Ad will be locked Saturday afternoon. Buyer pays transfer fees. If the buyer completes the purchase of an Aero EPC9 or Aero M5 stripped lower from Tigard Pawn 4...
  5. Local Loader

    Stripped lower receiver AR-15 $30

    PSA Stripped AR-15 lower receiver blem $30. https://palmettostatearmory.com/blem-psa-ar-15-lower-safe-fire.html?utm_medium=email&utm_source=daily_deals&utm_campaign=20230606&utm_term=morning&utm_content=
  6. Local Loader

    Stripped lower receivers M4A1 $40

    PSA M4A1 Stripped Lower Receivers $40 https://palmettostatearmory.com/psa-m4a1-stripped-lower-receiver.html?utm_medium=email&utm_source=daily_deals&utm_campaign=20230606&utm_term=afternoon&utm_content=
  7. Chrispyboi

    Primary Weapon Systems MK1 MOD 2-M Stripped Lower BLEM x1

      1. For Sale
    • $250
    • Vancouver
    • Washington
    PWS MK1 MOD 2-M Multi-Caliber Lower, T6 7075 Forged, Hard Coat Black Anodized per MIL-A-8625F Type III Class 2, AR-15 Compatible Proprietary Parts Included: Left side magazine release, Bolt catch spring, Bolt catch screws, Tension screw, Bolt release lever, Bolt release through pin Weight: 7.6...
  8. B

    Close post thanks

      1. For Sale
    • $0
    • PUYALLUP
    • Washington
    Close
  9. B

    Double post (please delete)

      1. For Sale
    • $1
    • PUYALLUP
    • Washington
    Double post please delete
  10. farfrompar28

    Wanted!! Spikes Snowflkae stripped Lower

      1. For Sale
    • Shelton
    • Washington
    Looking for a spikes tactical snowflake lower. If you have one th sell text me at +13609709514
  11. DonkHumpington

    WTS/WTT> Spikes snowflake stripped lower

      1. For Sale
      2. For Trade
    • $125
    • Silverlake
    • Washington
    New stripped spikes snowflake lower. Get it while you can.
  12. DonkHumpington

    FS> 2 AR Stripped Lowers & complete LPK kits

      1. For Sale
      2. For Trade
    • $1
    • Silverlake
    • Washington
    I have 2 complete kits for sale. Magpul MOE furniture, PSA LPK (including FCU) and stripped Anderson lower. Everything you need to build out a complete lower. $225 each or $425 if you buy both. Only trades I'm interested in: -G19 Gen 5 or G19X (will add cash) -factory new 5.56 (brass cased...
  13. M

    AR-15 lower receiver

      1. For Sale
      2. For Trade
    • $80
    • Kelso
    • Washington
    Stripped AR-15 will receiver. For sale until the new bill is signed into law. Yes it's price high. Don't wait till the last minute to buy something you should have had years ago. Save your hatred. serious inquiries only. $900
  14. FnM

    Anderson AM-15 stripped lowers

      1. For Sale
      2. For Trade
    • $70
    • Vancouver
    • Washington
    New and unblemished. Anderson’s reputation doesn’t need any support by me. $70 each. Will consider trades PM if interested. FFL transfer required
  15. tmanhawk

    PSA Stripped Lower

      1. For Sale
      2. For Trade
    • $65
    • Vancouver
    • Washington
    Brand new Palmetto state armory Ar15 stripped milspec lower. Had for years and don’t have any plans for it. I have a blem psa ar15 upper and giessele standard lower parts kit id sell all together for the right price. Buyer pays transfer Willing to travel short distance to your FFL or meet...
  16. arakboss

    Want To Trade Anderson Stripped Lower For Ammo.

      1. For Trade
    • Wilsonville
    • Oregon
    I have an Anderson Lower still sealed in factory packaging that I would like to trade for ammo. The ammo must be of recent production (5 years or so), brass cased, boxer primed and in factory packaging. I am starting with an asking value on the lower of $75. I will consider in trade, the...
  17. shlo812

    WTS (2) Smith & Wesson stripped lowers

      1. For Sale
      2. For Trade
    • $100
    • Chehalis
    • Washington
    For sale are two Smith and Wesson M&P15 stripped lowers. Both are brand new and have never been built on. They come with original box and papers from the factory. Price is $100 each and transfer is on the buyer. Meet in Centralia/Chehalis.
  18. arakboss

    Aero Blem M5 Stripped Lower & Free Generic Ambi CH $109 + shipping. Use code save5now to get the discount.

    https://www.deltateamtactical.com/aero-precision-lr-m-bare-stripped-lower-receiver-blem-89433.html Add about $12 worth of other products to your order and get free shipping. Tigard Pawn has non-blem M5 lowers in stock again for $150 so if you are not a fan of blem products, that is an...
  19. Y

    For Sale Aero Precision M5 stripped lower & assembled upper. I WILL SHIP

      1. For Sale
    • $250
    • Yakima
    • Washington
    Both brand new in box. $250 for both. I will ship to your FFL.
  20. Wyo79

    Aero M4E1 stripped lower.

      1. For Sale
      2. For Trade
    • $4300
    • La Center
    • Washington
    $4300.72 Figure since these will be obsolete and illegal soon I’d put my treasure up for sale. I see Anderson stripped lowers go for 2500-3000 so I figured $4300.72 would be a steal knowing the quality difference. All jokes aside !!! Brand new. Bought not knowing if WA communistic bill...
Copeland Custom Gunworks
Sporting Systems
Tigard Pawn 4 More
Bear Creek Arsenal
Southwest Firearms Forum
Cerberus Training Group
Back Top