IN addition, this old post of mine;

Bolding in this paragraph is by me.

" Channel samples taken from the A-4 shaft include: 19.86oz/t Au (681.0 g/t
Au) over 37cm taken from the 10m level (with a duplicate check sample assaying
17.2 oz/t Au (591.0 g/t Au) over 37cm); 2.09 oz/t Au (71.6 g/t Au) over 1.0
metre taken from the 10m level; and 11.87 oz/t Au (407.0 g/t) over 25cm taken
from the 30m level. To date, 20 quartz-vein samples collected from the A-4
Vein System returned a weighted arithmetic average grade of 2.37 oz/t Au (81.3
g/t Au) across an average vein width of 30.4cm (about twice the average width
of the ZCV#1 Vein). It is important to note that the average grade does not
include the duplicate check sample (17.24 oz/t Au) and that there is often
more than one vein exposed at the levels sampled. In addition to gold
occurring in the quartz veins, it also occurs in ore-tenor concentrations in
adjacent rock units (andesite dyke, fault gouge and weakly-altered
granodiorite.)"

Ore: by definition, ore is an accumulation of mineralisation that can be mined economically, and is quantified in an ore reserve estimate.

Tenor: the metal content of a sulfide mineral calculated on the basis of 100% sulfide - this is DIFFERENT to grade. For example, in disseminated sulfide mineralisation the nickel or copper tenor of the sulfide may be quite high, but the grade of the overall rock may be quite low. High tenor sulfides can form high grade concentrates from low grade ores.

http://agoracom.com/ir/steliasmines/forums/discussion/topics/604888-a-2007-news-release/messages/1896685