Q:
May I mark my lie with a mini, then decide to place the original disc back in position and pick up the mini?

A:
No. The thrown disc may only be used to mark the lie if it has not been moved. Once it has been moved, it can no longer be used to mark the lie. To avoid that situation, place your mini without moving the thrown disc. You may now choose either of the two discs to mark your lie, and simply pick up the other one once you’ve decided.

Applicable Rules: 802.03 Marking the Lie.