The first example was achieved using a texture map.

 

The next image without texture map, some adjustments were made to the colors to give it a darker metalic appearance.

 

I have not tried using shader mixer as yet, but I am sure the results can be improved.

 

Here are some settings I used for the second image:

Diffuse:
    color = 255,255,255
    strength = 5.0%

Specular:
    glossiness = 80.0%
    color = 255,255,255
    strength = 95.0%

Ambient:
    color = 4,4,4
    strength = 10.0%

Reflection:
    color = 232,232,232
    strength = 80.0%

General:
    lighting model = Glossy (Metalic)

*note: it also varies with the lighting you are using too. So experimenting may be required.