The site tagged more than 2,000 movable assets with passive ultra high frequency (UHF) RFID tags and ran the system for 12 months. Passive UHF tags carry no battery: each harvests energy from the reader’s radio signal in order to reply, which lets a fixed reader or a handheld identify hundreds of items in bulk from a few metres away.

Why asset control breaks down on a Tanzanian mine site

Tanzania is one of East Africa’s major gold producers, with gold accounting for close to half of the country’s total merchandise exports. Many of its mid-sized mines sit in the gold belt around Lake Victoria, where movable assets such as excavator parts, maintenance tools, generator sets and pump and valve spares have long been lost to theft, unauthorised borrowing and simple disappearance.

The source names three reasons. The first is the ground itself. Many Tanzanian gold mines run open pit and underground operations side by side, with working faces, repair stations and storage areas scattered across the concession, some tens of kilometres from the main gate. The climate is hot, humid and dusty, so paper ledgers and barcode labels corrode and peel off, and the lack of a satellite signal underground rules out GPS tracking at scale.

The second is the workforce. Tanzanian mining leans heavily on outsourced crews and temporary labour, so tools move constantly between in-house teams and contractors. Manual registration gave no formal process for lending equipment and no trail for tools used across areas, and assets were sometimes taken off site altogether.

The third is the pace of digitalisation. One round of hand counting took three staff two full days, with miscounts common enough that book records did not match what was on the ground, and weak asset control kept insurance premiums high. Industry research cited by the source puts the loss across large and mid-sized East African gold mines at 5% to 15% of annual operating budget each year, and notes that a single missing generator or drilling pump can stop a whole shift at a cost of thousands of US dollars an hour.

What the mine deployed

The system has four parts: metal-tolerant ceramic industrial tags, fixed readers at the entry and exit points, handheld terminals for site patrols, and a cloud asset management platform, all specified for high temperature, vibration and the metal interference that comes with tagging steel plant. Each asset was tagged with an IP68-rated anti-tamper tag carrying a unique electronic identity code, IP68 meaning the enclosure is dust tight and survives prolonged immersion in water.

RFID gate portals at the entrances and exits trigger an audible and visual alarm the moment a tagged asset tries to leave the controlled area without approval. Handheld scanners let managers sweep the site for missing equipment, turning searches that used to take days into a job of minutes. Check-in, issue, transfer, return and maintenance are captured automatically, with no manual ledger entry.

The reported results after 12 months

Alongside the 73% year on year fall in the loss rate and payback inside 11 months, the source reports that gate alerts alone avoided roughly USD 120,000 of theft and unauthorised removal losses in the first quarter after go-live, and that replacement equipment procurement costs fell by USD 85,000 a year.

The mine also won a 12% cut in its insurance premium rate on the back of the improved asset control, and recorded a 4% rise in overall equipment availability as interruptions caused by missing tools became less frequent. Stocktaking dropped from a two-day manual count to a two-hour automated sweep, saving 480 labour hours a year. More deployments of this kind sit in the asset tracking archive.

Why passive UHF rather than active tracking

The case for passive UHF over active locating equipment is one of cost and durability. Active tags carry a battery and transmit on their own, buying longer range at the price of replacement cycles and heat sensitivity. Passive tags tolerate high temperatures, cost a moderate amount to deploy and can be read in bulk, which suits the budgets and conditions of Africa’s many smaller mines. The source describes the system only as passive UHF and does not name an air interface standard.

The wider driver is compliance. The Tanzanian government has been pushing digitalisation across its mining sector, and responsible sourcing rules are tightening: the London Bullion Market Association’s responsible gold guidance obliges accredited refiners to verify the provenance of the gold they buy. Beyond tracing the ore, the source argues that digital asset management is becoming a baseline capability for a modern mine, and expects operations in Kenya and Ghana to follow.

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This article first appeared on RFID News (rfidnews.co.uk), the independent news site for RFID and NFC. Republication and AI use are welcome with RFID News credited as the source and a link to the original.