The gold bars are hidden at the following locations:

Acta Non Verba mission

The house with the Legionnaire's insignia has a gold bar in the safe box. All gold bars will be in similar boxes.

On your way to the mission's second objective, there is a house at a fork in the road with some Russians. Clear it out, then check the second floor of that house to find a gold bar.

A gold bar can be found south and west of the Russian missile armory; there should be a small white X-mark in make shift pit (this is on the south bank of the river). It is the same location where Haggard says, "I smell gold!" (the beach camp with several Russians).

When destroying the anti-tank guns in the town, there is a building on the east half of the town with a red (not blue) "Hotel" sign. The building is defended by several machinegun nests (mounted and emplaced). You must clear the opposition first. Check the second floor to find a gold bar. It is one of the few houses you cannot reach the attic because the box blocks the ladder access.

After guiding the tanks, you will be told to regroup at the smoke. Instead of doing that, go left of the smoke, and case the wall. You will see the gold bar on a table-like object.

Air Force One mission

Enter the building on the south end of the dam where trucks cross. It has two large boxes on the roof, and an SV98 and gold bar inside.

Enter the building where you have to destroy the radio equipment in the basement, in the room with all the explosives. The gold bar will be against the wall.

On the small island near an AA truck in the river, the gold bar is in the ruins of a small building that has no roof, with two enemy soldiers.

At the large base, after destroying everything and taking out the boats, look for a pair of two-story blue buildings. Next to them is a large white building. The gold bar is inside.

When you are sent out for fuel, go down the ramp. On the left will be a building with an "X". Inside is an RPG7 rocket launcher and gold bar.

Crossing Over mission

Before attacking the first antenna box, continue east down the road to a construction area. The gold bar is on top of some cinder blocks.

After attacking the second antenna box, there is a group of houses down the hill. The gold bar is under the barn with the APC.

Directly south from third antenna box, there should be a house with an "X" on it. Inside is the MG36 and the gold bar.

While crossing over the pools in the walkway, look to the north to find some shipping containers. The gold bar is on top of the containers. Jump over from the nearby staircase to collect it.

After fighting through the harbor, go down the ramp, and turn to your right. Move in that direction until you see a small green house in the corner of the zone. The gold bar is inside the house.

Par For The Course mission

Destroy the group of X spots directly above the west gun.

The island in the middle of the lake has a gold bar and an X spot with a collectible gun.

After you get the goggles and go to a weapons depot for some ammunition, there will be three tanks. The gold bar is behind the tanks on the golf course up the hill.

When you go around the mountainous rocks that separate you and the other pathway, you will reach the top of the map. At the tip of the map is an X and a tank. The gold bar is next to them.

A gold bar is at the rear of the mansion's bottom floor.