Identifying run on sentences

Front

Is this a run on? Two cowboys came to town they were looking for gold.

Back

run on

Front

Is this a run on? They heard about some gold in this town.

Back

correct

Front

Is this a run on? You need a license to look for gold they didn't have one.

Back

run on

Front

Is this a run on? They traded their horses for the license.

Back

correct

Front

Is this a run on? They couldn't get to the gold mine without the horses.

Back

correct

Front

Is this a run on? That was easy to fix they walked up the trail.

Back

run on

Front

Is this a run on? One backpack was too heavy to carry up the mountains.

Back

correct

Front

Is this a run on? They threw away their pots and pans to lighten their load.

Back

correct

Front

Is this a run on? They were almost there they were a few miles from the gold mine.

Back

run on

Front

The cowboy wanted this pans back he wanted to look for gold.

Back

run on