How Much Gold is Actually in the Ocean Floor?

The oceans contain an immense amount of gold, estimated at around 20 million tons. With current prices, that gold could be worth over $700 trillion. However, it is spread throughout the seawater at extremely low concentrations. Significant deposits also exist on the seabed and in lost shipwrecks, but accessing deep ocean gold presents major challenges.

Oceans Contain Around 20 Million Tons of Gold Worth Over $700 Trillion

The total amount of gold dissolved in the ocean is estimated to be around 20 million tons according to various sources. With gold currently valued at around $1,500 per ounce, that ocean gold would be worth an astounding $771 trillion dollars if it was all easily accessible!

Of course, the problem is the concentration of gold in seawater is extremely low. Measurements suggest there is only around 1 gram of gold per 100 million metric tons of ocean water. Extracting gold at such minuscule concentrations is not viable with current technology. While oceans contain gold worth trillions on paper, actually recovering any significant quantity is currently near impossible.

Seabed Deposits Can Contain Significant Concentrations

While gold dissolved in seawater is dilute, there are locations on the ocean floor containing much higher concentrations in deposits.

• The seabed near New Zealand contains an estimated 500 million tons of gold deposits based on surveys according to the government. At $1,500 per ounce, those deposits would be worth around $15 trillion potentially.

• Deposits are also found off the coast of Alaska and Japan. Some of the richest seabed deposits lay over 35,000 feet below the surface.

• By one estimate, a seabed deposit located off the coast of South Africa could contain up to 1500 tons of gold worth over $60 billion based on current prices.

While alluring, actually mining this gold poses immense challenges which companies are still working to overcome with new technology.

Billions in Sunken Treasure Remains Scattered Across the Seafloor

Over thousands of years of seafaring, unfathomable quantities of gold and other treasures have been lost at sea. Shipwrecks from the Spanish Main, traders, pirates, and naval ships likely contain billions of dollars worth of sunken treasures.

• An estimated $60 billion in sunken treasure contained in lost shipwrecks lies beneath the waves according to expert estimates.

• In 2007, Odyssey Marine Exploration made headlines when they discovered a Colonial-era shipwreck containing 17 tons of valuable coins worth around $500 million.

• Some Indonesian wrecks may contain billions of dollars in sunken treasure based on historical records of their cargo.

• The British warship HMS Sussex reportedly sank in 1694 with up to $3.5 billion worth of coins and bullion on board.

Thanks to advanced submersibles and ROV technology, previously inaccessible wrecks are now being explored and valuable coins and artifacts recovered. But finding and salvaging deep ocean wrecks remains extremely challenging and costly.

Major Deep Sea Mining Projects Seeking Ocean Floor Riches

While no large scale mining of the seafloor or shipwrecks is taking place yet, many major projects are in development:

• Nautilus Minerals is working on developing massive seabed mining robots and equipment to mine deposits off Papua New Guinea containing an estimated 10 tons of gold worth over $400 million.

• Neptune Minerals has projects focused on seabed deposits across the Pacific region estimated to contain around 150 million tons of ore.

• Odyssey Marine Exploration continuessearching for and salvaging valuable shipwrecks using advanced robotic subs and underwater archaeological techniques.

• The Deep Sea Nautilus research vessel is focused on studying underwater geology and deposits and perfecting new seabed mining technology.

Challenges Facing Deep Sea Gold Mining

While deep sea mining has tantalizing potential, it faces huge economic and technological barriers:

• Regulations on deep seabed mining are still being developed under the United Nations Law of the Sea. Ownership rights pose legal hurdles.

• The technology does not yet exist to efficiently extract and process gold at depths up to 35,000 feet and transport it to surface vessels. Massive new specialized ships, robotic equipment, and underwater dredging systems would need to be engineered.

• Environmental impacts are unknown – seabed ecosystems could potentially be damaged or contaminated by large scale mining. Careful regulations would be crucial.

When Will Economically Viable Deep Sea Mining Occur?

According to my analysis, deep sea mining for gold may become more mainstream in the next 10-20 years as technology improves. Here are some key factors:

• If deep sea mining costs can be reduced from around $40,000 per ounce of gold recovered down to around $2,000 per ounce, it becomes vastly more viable.

• If gold prices rise from around $1,500 per ounce to $3,000 or more, deep sea mining would have better margins to offset its risks and high costs.

• As robotic and computer technology improve, automated and unmanned solutions may help reduce labor costs and risks. Drones and AI could map deposits, while advanced underwater dredging robots mine material.

• With advances in materials like new lightweight metal alloys, more efficient and cheaper ships and equipment can be built to withstand deep sea pressures.

My view is that we will certainly see larger and more serious deep sea mining efforts emerge in the coming years. But it will still require major technical breakthroughs before the oceans‘ vast gold deposits become a mainstream source of supply. An exciting frontier to keep watching!

Conclusion

While quantifying the total amount of gold in the oceans is complex, reasonable estimates suggest there are tens of trillions of dollars worth dissolved in seawater and contained in seabed deposits and shipwrecks. Recovering even a fraction of this would be transformative, but deep sea mining remains highly speculative and challenging. With more work on technologies and cost efficiencies, tapping into the hidden treasures in the depths could go from fantasy to reality within a couple decades. The riches of the ocean floor likely hold immense untapped potential.