Where does the purest gold come from?

The purest gold commercially available is obtained through intricate refining processes, irrespective of its original source. Gold, an element that has captivated civilizations with its luster and value, is not often found in its purest form in nature. However, through technological advancements and precise methodologies, we’ve been able to achieve gold purity levels that near perfection. Let’s delve deeper into where gold originates and how its purity is achieved.

Natural Sources of Gold

In its natural state beneath the Earth’s crust, gold is typically alloyed with other metals. These alloys are influenced by the geological conditions of the region. Areas such as the Witwatersrand Basin in South Africa, parts of Western Australia, and certain locations in Nevada, USA, are renowned for their high-grade gold deposits. Even in these gold-rich terrains, the naturally occurring gold is not 100% pure but rather exists in a state mixed with other metals and impurities.

The Road to Refinement

The journey from raw, mined gold to the pure gold we recognize is paved with sophisticated refining processes. These methods are designed to isolate gold from its natural companions, achieving the desired purity levels.

• The Miller Process: This is an initial refining step where chlorine gas is blown through molten gold, effectively removing silver and base metals. The resultant gold from this process is about 99.5% pure.
• The Wohlwill Process: For higher purity standards, the Wohlwill process is employed. Through electrolysis, where gold is subjected to an electric current in a hydrochloric acid and gold chloride solution, this method can achieve an impressive 99.999% gold purity.

While these processes are standard in the industry, continual technological innovations ensure that newer methods are explored, aiming for efficient and environmentally friendly refining processes.

A Standard in Purity

In the world of commerce and finance, the purity of gold is paramount. Gold bars and coins, especially those tailored for investments or held in reserves by central banks, usually boast a purity of 99.99%. This almost pure gold is a product of rigorous refinement and is supplied by major refineries worldwide, from Switzerland’s meticulous refineries to Australia’s Perth Mint.

To sum up, while the Earth provides us with gold laden with potential, it is human endeavor and technological prowess that transform this potential into the purest gold we seek. Whether it’s for technological applications, investment, or adornment, the value and demand for pure gold remain undiminished, driving industries to ensure its availability.