How long has Shanxi Black been quarried, and is the supply stable?

Large-scale quarrying of Shanxi Black began around 1990. The total reserves are estimated at 193 million cubic meters. The mining area has a stable rock mass with large block sizes available for extraction. However, premium-quality Shanxi Black is considered a finite resource, and quarry output is limited, which contributes to its premium pricing. Major mining operations in the area include companies like Taiwan Mashan Mining (Shanxi) Co., Ltd., which produces approximately 5,000 cubic meters of raw blocks annually.