streamer

A streamer is a person who searches for and extracts tin ore from streams and riverbeds, working alluvial deposits rather than hard rock mines. The work involves panning, sluicing, or using simple separation equipment to recover cassiterite (tin oxide) from gravel and sediment in flowing water. Streaming remains economically viable in regions where alluvial tin concentrations are high enough to justify manual labour, particularly in Southeast Asia, parts of Africa, and historically in Cornwall and other tin-rich areas.

Cassiterite is dense (specific gravity around 6.9) and readily separates from lighter rock and clay when water velocity drops or when deliberately concentrated using gravity tables or pans. A streamer might work a section of riverbed by hand panning, or operate a simple rocker box or sluice box to process larger volumes of material more efficiently. The key advantage of alluvial tin over lode mining is that the ore is already partially liberated: no crushing or milling is needed before concentration begins.

Streamer operations range from individual prospectors working a single pan to semi-organised groups running multiple sluices or even small cutter dredges in larger rivers. The practice sits between artisanal subsistence work and formal placer mining; some streamers are licensed small-scale miners, others operate informally. Environmental impacts are significant wherever dredging or substantial earthmoving occurs, though hand panning itself leaves minimal disturbance compared to industrial extraction.

The term originated in regions of major tin production and is still used primarily in the Southwest England mining tradition and in active tin-producing countries. Historical streamers in Cornwall worked the Carnon River and other tributaries for centuries; modern streamers continue this work in Malaysia, Indonesia, the Democratic Republic of Congo, and other alluvial tin regions, often as family or community enterprises.