sturt

A sturt is an arrangement in tribute mining where a worker (the tributor) extracts ore from a mine and pays the mine owner a fixed share of the value extracted, keeping the remainder as profit. It is fundamentally a lease of mining work: the tributor assumes the risk and labor of extraction, the owner receives a guaranteed or negotiated portion of output without performing the extraction work.

The sturt developed in Cornish tin and copper mining and remains a recognized practice in deep shaft mining where geological risk is high. The tributor or group of tributors bid for the right to work a particular block or level of the mine, offering to pay the "tributing price" to the mine owner, typically expressed as a fraction or percentage of the ore's market value. The sturt is the difference between what they pay in tribute and what they actually extract and sell; a favorable sturt means the ore body proved richer than anticipated when the bid was made.

Risk and variation

The attractiveness of a sturt depends entirely on ore grade and accessibility. A sturt in a productive vein can be very profitable; the same arrangement in depleted ground results in loss. Tributors therefore inspect exposed ore faces carefully before bidding. Some mines offer partial advances or "setts" (defined areas) to reduce guesswork. In historical Cornish practice, the tribute share paid to the mine owner ranged from one-quarter to one-half of gross value, but the actual sturt depended on extraction costs: wages for the crew, timbering, pumping, and haulage.

The system created a class of independent working miners who owned neither the mine nor the equipment but owned their skill and bore the operational risk. A good sturt could support several men for months; a bad one ended in debt. The word itself is sometimes spelled "start" in older documents, though the etymology is uncertain and may relate to a division or allotment of work.

Although less common in modern industrial mining, sturt-like arrangements persist in artisanal and small-scale operations, particularly in regions with deep, difficult geology where fixed-wage extraction is uneconomical. It remains a useful model for understanding how risk, reward, and access to resources are negotiated in extraction trades.