The Britannia Mine Concentrator was a massive building filled with hundreds of machines, but the basic process was relatively straightforward. Ore moved through different levels of the Mill, where it was crushed, ground, separated and prepared for shipment.
Understanding this flow helps explain why the building was designed vertically and how its machinery worked together.
Crushing and Grinding
The upper levels of the Concentrator were dedicated primarily to reducing large pieces of mined rock into much smaller particles.
Ore passed through crushing equipment before entering ball mills, where it was ground into a fine powder. This preparation was necessary before the valuable copper-bearing minerals could be separated from the waste rock.
Froth Flotation
Once finely ground, the material moved to the flotation stage. Here, the powdered rock was mixed with water and specially selected chemicals.
Air was introduced into the mixture, creating bubbles. Copper-bearing chalcopyrite particles attached to these bubbles and rose to the surface, where the mineral-rich material could be collected.
This process separated much of the valuable mineral content from the unwanted rock.
Thickening and Dewatering
After flotation, the copper-rich material was known as concentrate. It moved to large thickening tanks near the bottom of the Mill.
Inside these tanks, heavier mineral particles settled while water separated from the concentrate. This reduced its moisture content and prepared it for transportation.
From Britannia to the Smelter
The finished concentrate was shipped from Britannia to smelters, where it underwent further processing at high temperatures. Smelting and refining eventually produced purified copper that could be used commercially.
A Process That Endured
Modern mineral-processing facilities still follow many of the same basic principles: crushing, grinding, separation, dewatering and smelting. Today’s equipment and chemical processes are more advanced, but the fundamental sequence remains recognizable.
The effectiveness of Britannia’s system allowed much of the Concentrator’s machinery to remain in service for decades, making the Mill an important example of early 20th-century copper-processing technology.