Follow the trail to a road through the woods. Follow this road half a mile to a trail junction just before a private residence. Follow the small red DEC trail markers as the trail skirts right around the home and heads off into the woods. Make sure to follow the small red markers as snowmobile trails are also in the area. You will see a trail heading off to the left towards Lapland Pond. Ignore this and continue on towards the summit.
At 2,646 feet you are at the summit of Black Mountain where you will find a fire observers cabin and a firetower. If you wander around the summit a bit you will find excellent views up through the Narrows of northern Lake George. Continue on and take the trail that leads down off the southern edge of the summit towards Black Mountain Point. This will then intersect with another base trail where you will head west (left) towards Lapland Pond Junction.
At the Lapland Ponds junction head north (left), follow the blue markers and this will bring you back to the original trail you came in on and after about 2.2 miles you should reach your car.