The mina (or also: mine) is an ancient Greek unit of weight defined as being 50 shekels.
The mina, like the shekel, was also a unit of currency. In ancient Greece it was equal to 100 drachmae. Silver half-shekel struck in the Greek colony of Taras, during the Punic occupation. ... Drachma, pl. ...

In ancient Sumerian times, a m'na was a unit of weight: but Talents and shekels weren't around in ancient sumeria. 1/60 talents and also 60 shekels.
Since the Akkadian period, 2 m'na was equal to 1 sila of water (cf. clepsydra, water clock). (The Sumerian king list contains a traditional list of the early dynasties; however much of it is probably mythical, and only a few of the names have been authenticated through archaeology. ... A talent is an ancient unit of mass. ... Silver half-shekel struck in the Greek colony of Taras, during the Punic occupation. ... Akkadian language city of Akkad or Agad Akkadian Empire Sargon of Akkad the Amarna letters and Amarna Letters EA 296(Yahtiru) This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same title. ... A water clock or clepsydra is a device for measuring time by letting water regularly flow out of a container usually by a tiny aperture. ...

Note, that the word "mine", in the sense of land mine came from the form of this ancient weight stone. A land mine is a type of self-contained explosive device which is placed onto or into the ground, exploding when triggered by a vehicle, a person, or an animal. ...