Need some help with new terrain ore/resources for mining

[xxx73]

Hi guys

I need some help with some questions I have.

1) I have added some new terrain resources/ores underground for mining, but I can only use colors/textures for already existing resources/ores.

Im really a noob about this and I have tried changing settings in texture and Map.Color for the new blocks, but it have no effect.
B. How can I change/make new texture/colors for resources underground?

2) I like to spread the different terrain ore/resources at different depth underground.
I see there is something about layers in biomes.xml, but all numbers are low so it don't make sense to me.
I also like to make layers underground like in minecraft, in that game layers get harder the longer down you dig.

C. So How can I spread ores/resources in different depths underground?

Example: Here I just made many copies of terrStone with different HP, and added different ores at different depth

As said I dont really understand the layer system and its numbers, anyway I made this as an example, will something like this work properly?

Spoiler

            <layers>
                <layer depth="1" blockname="terrForestGround"/> <layer depth="3" blockname="terrDirt"/>
                <layer depth="*" blockname="terrStone">
                    <resource blockname="terrOreIron" prob="0.6500" rwgGenerationType="all"/>
                    <resource blockname="terrGravel" prob="0.7830" rwgGenerationType="all"/>
                    <resource blockname="terrOreSilver"  prob="0.00003" rwgGenerationType="all"/>
                    <resource blockname="terrOreGold"    prob="0.00002" rwgGenerationType="all"/>
                    <resource blockname="terrOreDiamond" prob="0.00001" rwgGenerationType="all"/>
                </layer>
                <layer depth="1" blockname="terrStone"> <resource blockname="terrGravel" prob="0.7830" rwgGenerationType="all"/> </layer>
                <layer depth="10" blockname="terrStone">
                    <resource blockname="terrOreLead" prob="0.6500" rwgGenerationType="all"/>
                    <resource blockname="terrGravel" prob="0.7830" rwgGenerationType="all"/>
                    <resource blockname="terrOreSilver"  prob="0.00030" rwgGenerationType="all"/>
                    <resource blockname="terrOreGold"    prob="0.00020" rwgGenerationType="all"/>
                    <resource blockname="terrOreDiamond" prob="0.00010" rwgGenerationType="all"/>
                </layer>
                <layer depth="20" blockname="terrStone1000hp">
                    <resource blockname="terrOreMagnesium" prob="0.6500" rwgGenerationType="all"/>
                    <resource blockname="terrGravel" prob="0.7830" rwgGenerationType="all"/>
                    <resource blockname="terrOreSilver"  prob="0.00150" rwgGenerationType="all"/>
                    <resource blockname="terrOreGold"    prob="0.00120" rwgGenerationType="all"/>
                    <resource blockname="terrOreDiamond" prob="0.00090" rwgGenerationType="all"/>
                </layer>
                <layer depth="30" blockname="terrStone1500hp">
                    <resource blockname="terrOreZinc" prob="0.6500" rwgGenerationType="all"/>
                    <resource blockname="terrGravel" prob="0.7830" rwgGenerationType="all"/>
                    <resource blockname="terrOreSilver"  prob="0.00240" rwgGenerationType="all"/>
                    <resource blockname="terrOreGold"    prob="0.00210" rwgGenerationType="all"/>
                    <resource blockname="terrOreDiamond" prob="0.00180" rwgGenerationType="all"/>
                </layer>            
                <layer depth="1" blockname="terrStone"/>
                <layer depth="3" blockname="terrBedrock"/>
            </layers>

Im looking forward to some good answers