From r6s wiki
Gu mines are throwable devices that deploy on the floor and stick any attacker who steps on them with a poison needle.
Getting stuck causes visual distortion — sort of a swampy, queasy filter — and does damage over time as the needle remains in your leg. Attackers can either fight through the disorientation and take the damage, or they can follow the on-screen prompt to remove the needle from their leg, lowering their gun and leaving themselves vulnerable in the process.
Getting stuck by the needles deals an initial 10 damage, followed by 8 periodically. Until removed, the needle will continue to deal its periodic damage.
While poisoned, an Operator cannot sprint.
Gu mines are cloaked and all-but-invisible to anyone but Lesion and IQ’s electronics detector.
Although invisible, they can still be destroyed like any other gadgets with bullets and explosions. Since it is considered an electronic device, Thatcher and Twitch are able to destroy it with their respective gadgets. Bandit can also accidentally destroy these devices under the same criteria.
Lesion can see a small icon above each deployed trap, and keeping an eye on those icons can help you respond quickly when one is triggered or destroyed.
Only Lesion can see these icons, thus communication is critical if he wants to take advantage of this intel.
There can be a total of seven mines deployed. However, he doesn’t start with a full complement of traps; he acquires them as time passes. The cooldown timer on-screen shows you how many you have available and how long until another one is ready.
Lesion starts with one trap. Every 35 seconds thereafter, Lesion refills another trap, and can only attain 7 total per round.