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The world’s biggest mining companies would like you to put more zinc in your zucchini and copper in your socks and dental floss.

While builders and manufacturers remain the biggest metals users, producers are confronting the end of a Chinese industrial boom that fuelled surging global demand and prices.

“Traditional demand isn’t going to fall off a cliff,” said Paul Gait, an analyst at Sanford C. Bernstein in London. “But it’s true that no one wants to hear about industrial production growth or Chinese cement demand anymore.”

Mining companies have toyed with exotic uses for years, but the search took on new urgency as the economy began to mature in China, the world’s biggest buyer of metals.

This year, the country will have its slowest growth in copper use in a decade, Barclays analysts said last month. Base metals including aluminium and nickel are heading for their first quarterly decline in more than a year.

In May, Moody’s Investors Service downgraded China’s sovereign debt, sparking concern that tighter credit will hurt smokestack industries.

Fixed asset investment trailed estimates last month as the country’s property market cooled and the country sought to rein in credit, data showed last Wednesday.

China consumed almost half of the world’s refined copper in 2014 as the country’s demand surged 8.8pc from a year earlier, Barclays estimates. Since then growth has been slowing, and by 2020 the bank estimates China usage will increase just 1.5pc.

The economy that was growing at double-digit rates through most of the 2000s has slowed every year since 2010 to about 6.7pc last year, data compiled by Bloomberg show.

That’s forcing company executives to focus on ways to bolster future growth.

“There is a huge opportunity for metals such as copper, from developing batteries to store renewable energy, to the copper motor rotor used” in Tesla Inc. electric vehicles, said Robert Dwyer, associate director of environment at the Copper Alliance.

Copper’s ability to kill microorganisms is a selling point for new household and industrial products, which could boost demand for the metal by as much as 1 million metric tonnes a year, expanding annual usage by 20m tonnes over the next two decades, according to data from Bernstein. Global demand for all uses last year was about 23.2m tonnes, according to Barclays.

Purdue University in Indiana is purchasing weight-lifting equipment coated with the metal for a new athletic facility scheduled to open later this year. The goal is to reduce instances of flu and viral infections, said Justin Lovett, a Purdue football director.

Cages lined with copper are being used on salmon farms in Chile, Japan, Canada, Australia and Norway to fight the spread of bacteria, said Ricardo Benavides, technical director at EcoSea Farming, which produces the cages in Chile.

Codelco, Chile’s state-owned mining company and the world’s largest copper producer, has promoted using the metal in hospitals, airports and even socks — 1.4m pairs sold last year in Chile. The company has invested about $10m in new applications over the last five years, according to Sebastián Carmona, interim head of Codelco’s technology arm.

The mine owner also has encouraged innovation with $50,000 grants to entrepreneurs, including antibacterial baby clothes, dental floss with copper nano-particles and a copper-based material that can be used for 3D printing of orthopaedics.

New uses are also being developed for aluminium. Arconic Inc., a maker of aluminium parts for cars and planes, is investing in facilities to support the use of metals by three-dimensional printing machines, which use computer software to manufacture products.

After a slow start, usage of aluminium is growing in 3-D printing, along with titanium, cobalt and chrome, as the technology moves products out of testing and into commercial use in industries like aerospace, said Terry Wohlers, the founder of industry consultant Wohlers Associates in Fort Collins, Colorado.

About $542.2m of 3-D printers for metals were sold last year, or 9pc of all sales, Wohlers estimates. By 2022, sales will increase more than fourfold to $26 billion and with machines devoted to metals growing faster than the industry overall, he said.

Sales are growing for zinc-infused fertilisers from companies including Mosaic Co., especially after a 2008 study estimated 450,000 children under the age of five die each year from zinc deficiency.

Adding zinc into fertilisers could consume as much as 600,000 tonnes of the metal — or about 4pc of global demand.

At a conference last month, Glencore boss Ivan Glasenberg promoted the idea that his company mines minerals like cobalt, nickel and copper needed to build the growing number of electric vehicles.

If 95pc of the world’s auto sales are electric vehicles by 2032, the industry would need 20m tonnes of copper annually. For cobalt, that scenario would mean an increase in demand of 679,000 tonnes.

Manufacturers in China aren’t taking any chances. Production capacity for copper foil — a component in the anodes used in lithium-ion electric vehicle batteries — is set to double within the next two years as 15 new manufacturing plants ramp up, according to the International Copper Study Group.

Metal producers should take their cue from the aluminium industry to prepare for changes in demand, Bernstein’s Gait said. When oversupply left prices low, aluminium producers invested in downstream ventures to promote the lightweight metal as a substitute for steel and copper in such products as autos and electrical wiring.

Bloomberg/The Washington Post Service

Published in Dawn, The Business and Finance Weekly, June 19th, 2017