It might be required for you to import the package if you encounter any issues (like casting an Array). So better be safe than sorry and add the import import mods.immersiveengineering.MineralMix;.

You can get and set the failchance for the Mineralmix using the failChance [ZenSetter/Getter] on the object.

Required	Type	Datentyp
Required Required	Type Name	Datentyp string

ZenScript
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//Example:
Excavator.getMineral(String Name);

var Iron = Excavator.getMineral("Iron_Ore");

Required	Type	Datentyp
Required Required	Type Ore	Datentyp string
Required Required	Type Chance	Datentyp string

ZenScript
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mineralMixObject.addOre("oreIron", 0.5);

You will need to use the oredict names.

Required	Type	Datentyp
Required Required	Type Ore	Datentyp string

ZenScript
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mineralMixObject.removeOre("oreIron");

ZenScript
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//Getter
mineralMixObject.failchance;

//Setter
mineralMixObject.failchance = 0.5;

ZenScript
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//Example:
import mods.immersiveengineering.Excavator;
import mods.immersiveengineering.MineralMix;

//Get The Mineral Mix
mods.immersiveengineering.Excavator.addMineral("Iron_Ore", 50, 0.005, ["oreIron", "oreDiamond"], [0.005, 0.01], [1, 0, -1]);

var Iron = Excavator.getMineral("Iron_Ore");

Iron.addOre("oreIron", 0.5);

//Print Initial Fail Chance
print(Iron.failChance);

//Set The Fail Chance to 25%
Iron.failChance = 0.25;

//Print Out The Fail Chance
print(Iron.failChance);

//Set The Fail Chance to 50%
Iron.failChance = 0.5;

//Print Final Fail Chance
print(Iron.failChance);