Daily Overviewのインスタグラム(dailyoverview) - 9月15日 02時18分

The Narva open-pit oil shale mine, in northeastern Estonia, is one of the world’s largest producers of shale oil. This Timelapse video illustrates the mine’s use of area stripping, a method that removes earth in long strips and uses overburden to fill the excavation produced by the previous strip. Estonia is second only to China in shale oil production and it is the only country in the world to use shale oil as its primary energy source.

Created by @Daily Overview
Source imagery: Google Timelapse

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