Reserves - reserves

Japanese: 埋蔵量 - まいぞうりょう（英語表記）reserves

The amount of material present underground down to the earth's crust. Usually refers to the amount of resources, and depending on the quality of the resource or deposit, it is called ore reserves or simply ore reserves for metal and limestone deposits, coal reserves or simply coal reserves for coal, etc. On the other hand, an ore deposit is defined as a collection of minerals that are profitable, but if market conditions or technological levels change, the calculation of profitability also changes, and therefore the definition of an ore deposit becomes unstable. Therefore, in Japan, the JIS defines the minimum predictable profitability limit for each type of mineral, and the amount of a group of minerals that can become profitable under this minimum limit is defined as a reserve.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

地殻までの地下に存在する物質の量。通常，資源の量をいい，資源または鉱床の質により，それが金属および石灰石鉱床ならば埋蔵鉱量または単に鉱量，石炭ならば埋蔵炭量または単に炭量などという。一方，鉱床とは収益性を伴う鉱物の集合体と定義されているが，市況や技術水準が変われば採算性の算定も変わり，したがって鉱床の定義も一定しなくなる。そこで日本ではJISによって各種鉱物の予想しうる最低採算限界を定め，この最低限界のもとで採算鉱となりうる限界の鉱物群の量を埋蔵量と定義することにしている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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