Ellen Smith, the editor of mine Safety and Health News, said the Upper Big Branch mine was the site of two fatalities in the previous 10 years.

《煤矿安全与健康新闻》的编辑艾伦·史密斯称，上大支流煤矿在过去10年里已经发生过2次灾害。

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"I've been saying this for years, but it certainly falls on deaf ears at MSHA (the federal Mine Safety and Health Administration)," Oppegard said.

“我一直说这几年，但它肯定属于聋子的耳朵在上msha的联邦矿山安全与卫生管理局”Oppegard说。

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In the year before the explosion, the mine safety and Health Administration (MSHA), a federal agency that monitors mine safety, cited the Sago mine 208 times for safety violations.

在爆炸发生的前一年，矿山安全和卫生署，一家负责监督矿山安全的联邦机构，引用了违反安全条例的Sago矿场多达208次。

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The team is in the final stages of licensing Gemini-Scout to a commercial robotics company, but for now, the Mine Safety and Health Administration will be the primary customer.

ENGADGET: Gemini-Scout robot can scope out mining accidents, may save lives (video)

The mine was shut down by the U.S. Mine Safety and Health Administration due to the unsafe buildup of sand and concrete material in the main shaft of the mine.

FORBES: Hecla's Lucky Friday Mine Rehabilitation Slightly Ahead Of Schedule, Restart In Early 2013

No production from the mine is expected this year after the federal Mine Safety and Health Administration ordered the Silver Shaft to be closed for removal of built-up sand and concrete material.

FORBES: Hecla Officials Anticipate Clean-Up Of Mine Shaft Can Begin In Few Weeks