The reaper throws a demolition charge on the ground; they do not stick to buildings. Two seconds later, it detonates, damaging friendly and hostile ground units and buildings in the vicinity. A red timer bar shows how long until it detonates.
The mines deal 30 damage + 30 against armored units and buildings although it appears to have increased as of December 2008. Mine explosions do not detonate other mines. However, they do inflict splash damage on friendly forces. They do not deal damage to burrowed units unless the player can detect them.
The mines are very small but visible. They can be hidden by units moving past them.
↑ 6.06.16.2In the current build you cannot destroy D-8 Charges. By that I mean that you can select them, but they are indestructible (they don't have HP like other units do, just like units caught by Arbiter's Stasis Field in SC:BW for example). If you are playing against Reapers though, you can still dodge the charges, as it takes them around 2 seconds to blow up. Kapeselus. 2010-01-29. Reaper Charges. Battle.net StarCraft II Gameplay Discussion Forum. Accessed 2010-01-29.
↑ 9.09.1D-8 charges don't stick to buildings. You can only throw them directly to the ground and if you target a building they will just appear next to it. They also only damage ground units, so they won't do any damage to your buildings if you manage to lift them off before the charges blow up.
You cannot damage burrowed zerg units if they are not affected by any means of detection. For example if you raid your opponent's mineral line and he burrows his drones you won't be able to damage them without a detector, like for example a Scanner Sweep.
Obviously once again I would like to remind you that this applies to the current build (yeah I know!) :) Kapeselus. 2010-02-03. Reaper Charges (post 13). Battle.net StarCraft II Gameplay Discussion Forum. Accessed 2010-02-03.
↑Reaper's explosive charge does actually damage allies, as well as your own units and buildings, so be careful when playing with those flashing packages. Zhydaris. 2010-01-25. Question on Baneling splash damage/friendlys. Battle.net StarCraft II General Discussion Forum. Accessed 2010-01-25.
↑Blizzard Entertainment. StarCraft II beta. (Activision Blizzard) (in English). February 18, 2010