Suggestion to add a effect to each that makes them strategically interesting besides beeing merely resources.
balterium patches will refract light in such a way that when small units remain stationary in or near them it cloaks them.
kinda like the how tall grass in moba games does.
the biotic patches will accelerate healing and when the substance is aplyd to torn/shot up armor it drys to becomes like a field repair for vehicles and aliens alike.
these patches will become rarer as the games goes on they get mined out but i think giving them some use besides just money will add a lot of interesting option for units in the field.