Accordingly, there can be no assurance as to the quantity or quality of such rare earth deposit or that such deposit will become proven or probable reserves.

因此也不可能保证稀土矿床或其他类似矿床的数量和质量能被核实或被合理地储备起来。

youdao

And unless carbon capture can work on a very large scale to bury emissions under ground and under the seabed, the 2 degree target means that no more than one third of proven reserves of fossil fuels can be consumed before 2050.

BBC: Burning issues for the world's future

To this day, the company has no proven, probable, or even possible reserves.

FORBES

Venezuela will no doubt revise its 296.5bn barrels of proven oil reserves to over 300bn barrels, just as a little treat for Chavez retaining office.

FORBES: Chavez Contagion: The Growing Risk To Latin American Oil