The Mine Safety and Health Administration approved its wireless Wi-Fi telephone units.

All previously announced installations can now proceed, as can future orders, according to ACT president Steve Barrett.

“This is great news for customers who want to get the productivity and safety benefits of ActiveMine to work as quickly as possible in their mines,” he said.

“We thank customers for their confidence in ActiveMine’s successful approval and MSHA for their assistance throughout the process.”

The approval is just in time – only weeks remain before the MINER Act deadline of June 15 for all 650-plus US coal operations to submit plans for wireless communications and tracking systems.

The first federal regulatory approval for the system was for its RFID Wi-Fi Tags, which were deemed intrinsically safe in September 2008.