R.I.P. Villard Wheel. Oh how we loved you

Halp ! For reason X I don't have an agent / need to find one !
Open the Agents tab of your People and Places window. Right click one of your agents, 'Show Info'. Click the Corp icon underneath their name. On this new window click the 'Agents' tab to get a list of *all* the agents for that corp, split by which ones you can use.

There are only Barron Asteroids / No Veldspar to mine ?
Right click the little white arrow next to the title bar of the overview. From this menu, select Default -> Mining to load the mining overview. This will let you find the single, lone veldspar asteroid to mine in the mission area.