drift mining

uncountable

Mining for gold by means of drifts in the gravel and detritus of old riverbeds.

Japanese Meaning

旧河床に堆積した砂利やがれきの中に形成された通路（ドリフト）を利用して金を採掘する方法

In the 19th century, many prospectors turned to drift mining to extract gold from ancient riverbeds.

19世紀、多くの探鉱者は古い河床の砂利や堆積物に横坑を掘って金を採る方法に頼った。

Sense（1）

Mining for gold by means of drifts in the gravel and detritus of old riverbeds.