UNITY (AP) — A sinkhole where a Pennsylvania woman fell to her death last month is now being filled with hundreds of cubic yards of grout in a bid to stabilize the site.

The work in the village of Marguerite, about 40 miles east of Pittsburgh, started just days after emergency responders found the remains of 64-year-old Elizabeth Pollard on Dec. 6, four days after she went missing while searching for her cat. The sinkhole was near a restaurant about a half-mile from her home

Crews have since pumped more than 3,300 cubic yards of grout into the site, the Pittsburgh-Tribune-Review reported, but it’s not yet known when the work will be completed.

The work was delayed this week due to snow and extremely cold temperatures.

State environmental officials said the crews are digging between 12 and 16 boreholes strategically placed across the property.

Each is being pumped with a cementlike grout mixture that will slowly spread over a roughly 25-foot area as it hardens, forming wide pillars to support the earth above.

Officials have said the sinkhole apparently began as a manhole-sized gap and may have only recently opened above where coal was mined until about 70 years ago. Hunters and restaurant workers in the area in the hours before Pollard’s disappearance told police they hadn’t noticed the sinkhole.