Mines Fire spreads in Santa Clara County east of Mount Hamilton; structures threatened

A fire burning in eastern Santa Clara County more than doubled in size on Monday after jumping a containment line.

The Mines Fire began at about 2 p.m. on Sunday in the area of Mines Road and San Antonio Valley road east of Mount Hamilton. The fire had burned at least 132 acres as by 5:23 p.m. Sunday and was 40% contained. Forward progress was reported stopped on Sunday evening.

On Monday afternoon, however, Cal Fire reported what it called a slop-over - when a wildfire crosses over an established control line - with a dangerous rate of spread to the east and structures threatened. By 4:34 p.m., an incident update listed the area burned as 283 acres.

Containment remained at 40%, according to Cal Fire.

The cause of the fire was still under investigation as of Monday afternooon.

This is a breaking news update. More information to be added as available.