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United States
Boron Mine

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 Location:
6 km NW from Boron, California, United States

  Address:
Suckow Rd
Boron
California, United States
93516
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Mining
  • Processing
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  • Reserves
  • Financials
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Borate
Mining Method
  • Truck & Shovel / Loader
Processing
  • Dissolving & Crystallising
The open-pit mine in Boron, California is one of two world-class borate deposits on the planet.


Owners

 
CompanyInterestOwnership
Rio Tinto plc 100 % Indirect
Rio Tinto Minerals Inc. 100 % Direct

Deposit Type

  • Sedimentary


Summary:


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining borates relies primarily on a combination of drilling, blasting and shovelling to collect ore, which is then hauled to massive crushing machines and, from there, to refinery centres.

Once the ore and overburden are loosened, enormous shovels scoop up the rubble from the bottom of the mine and dump it into haul trucks that can carry 220 tonnes each.

Ore from the mine must be crushed before it is refined. Powerful crusher machines reduce the ore to 2.5cm long pieces, increasing the ore's surface area to make the refining process more efficient. Ore is transported out of the mine and throughout the refinery via an extensive system of conveyors.


Crushing and Grinding


Processing

  • Dissolving & Crystallising

Source: Subscription required

Summary:

There are six primary steps to refine raw ore into refined borates. The bulk of this process was developed at the Boron Operations:

1.Dissolving – Crushed ore is mixed with hot liquor – a combination of borates and water. The borates dissolve in the water. Insoluble rocks, sand and other solids are removed using screens.

2.Settling – The saturated borate solution is pumped into large settling tanks called "thickeners". Because the rock and clay mixture is heavier, it settles to the bottom of the tank, leaving borates dissolved in water – or liquor – on top.

3.Crystallising – The liquor is transported to tanks called "crystallisers" to be cooled. The drop in temperature forces the borates to crystallise, forming a slurry of borate crystals and water.

4.Filtering – The slurry is poured over special fabric filters and washed to ensure purity. Water is drawn away by a vacuum beneath the filter.

5.Drying – Damp borate crystals are t ........


Production:

CommodityUnits201920182017201620152014
B2O3 kt  ......  Subscription required  ......  Subscription required517503476508
All production numbers are expressed as crystals.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required576 kt of b2o3 crystals576 kt of b2o3 crystals
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage Commodity
Proven 12 Mt Borate
Proven 12 Mt B2O3
Probable 4.4 Mt Borate
Probable 4.4 Mt B2O3
Proven & Probable 16 Mt Borate
Proven & Probable 16 Mt B2O3

Financials:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 28  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 624  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 103  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 178  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 24, 2019
....................... Subscription required ....................... Subscription required Subscription required Sep 7, 2019
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Annual Report 2017
Annual Report 2016
Other 2016
Annual Report 2015
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Aerial view:

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