Manusmriti

siva.sh/manusmriti/8/39

निधीनां तु पुराणानां धातूनामेव च क्षितौ । अर्धभाग् रक्षणाद् राजा भूमेरधिपतिर्हि सः ॥ ३९ ॥

sanskrit

The king obtains one half of ancient hoards and metals (found) in the ground, by reason of (his giving) protection, (and) because he is the lord of the soil.

english translation

nidhInAM tu purANAnAM dhAtUnAmeva ca kSitau | ardhabhAg rakSaNAd rAjA bhUmeradhipatirhi saH || 39 ||

hk transliteration by Sanscript