An Asteroid 1.2 km across has been discovered at the Earth Sun L4 region. This is the second asteroid discovered in one of the Lagrange volumes of the Earth Sun with the other one about a third of that size. It is suggested that it is possible that there are more, quantity unknown, bodies in those regions. They are very hard to locate from Earth due to the distance and sun angle so actual number, makeup, and size in each L region is mostly speculation.
I think it might be possible that this is an ideal target for in situ resource utilization. The advances in cubesat capabilities open many new possibilities. A lander could test out a number of resource extraction techniques for immediate use. Regolith shielding? Steam rocket with whatever volatiles are located? Sintered structure in vacuum and low gravity? Low tech metal extrusion for structural components? Low tech film Solar sails?
The purpose would be to use it as a base to locate other materials in the region with a relatively small scope. And go visit them if found using local resources. Prospecting and exploring and evaluating. If there does turn out to be a large number of bodies in the L4 region, DeltaV per visit should be very low. This one is a C type, dark and carbon. There might just be enough variation in different bodies in the area to make it a resource rich destination.
How simple and cheap could a probe be and still investigate the possibilities??