まいぞう埋蔵maizou
1.

The act of concealing or hiding something by placing it underground, often for a prolonged period of time.

2.

The phenomenon in which natural resources, such as minerals or fossil fuels, exist buried beneath the earth's surface, indicating their potential for extraction.

Example:

彼らは埋蔵された宝物を求めて砂漠を探検した。

まいぞうきん埋蔵金maizoukin
1.

A hidden or concealed reserve of wealth, often thought to be stored beneath the ground, usually referring to precious metals like gold.

2.

Surplus funds from a government’s special accounts that are considered available for use in policy initiatives or economic strategies.

まいぞうりょう埋蔵量maizouryou
1.

地下に存在し、将来的に採掘や利用が可能な資源の量。

2.

経済的に価値がある資源が地中にどれだけ蓄えられているかを示す指標。