A 10-year-old girl who survived a fall into an Arizona mine shaft remained in serious condition Tuesday in a Las Vegas hospital.
No other information was available on the medical condition of Casie Hicks.
The girl fell along with her sister into the shaft while riding an all-terrain vehicle in the hills near Chloride during the weekend.
Hicks' sister, 13-year-old Rikki Howard, was found dead in the shaft.
The mine where the girls fell is next to a dirt road, obscured by brush and had no signs or barriers.
It is believed to be inactive.
Arizona State Mine Inspector Joe Hart said federal land-use maps indicated that the accident occurred at the Brighter Days Mine located on private land.
Hart said he did not immediately have any further information about the property or the mine's ownership.
Efforts to find the mine's owner through searches of Arizona and Nevada incorporation records were unsuccessful.
Officials say there are an estimated 100,000 abandoned mines in Arizona, not uncommon in a state with a long history of gold and silver prospecting and other kinds of mining activity.
Many date back to the late 1800s and early 1900s.