The functionality of these mines is uncertain. However they do not appear to be capable of moving, and they have proven capable of breaching Asgard shields and severely damaging the hull of BC-304s. Due to the weakened nature of the shields caused by a neutron star and weapons fire from three Lucian Alliance Ha'taks, their true power is still unknown. (SG1: "Company of Thieves")
In 2006, the Odyssey had been sent to investigate a strong gravitational disturbance Stargate Command thought might be a Supergate, but they discovered that it was a neutron star that affected their shields. They discovered three Goa'uld Ha'taks controlled by the Lucian Alliance who attacked them. They understood that they had been deceived.
A Lucian Alliance Ha'tak attacked and, by damaging its hyperdrive, forced Odyssey to escape into a minefield composed of these mines. The ship impacted some of the mines, which exploded, resulting in the ship being left badly damaged and some of her crew including Lt. Colonel Samantha Carter and Major Kevin Marks being knocked unconscious due to the impact of the explosions. (SG1: "Company of Thieves")