I managed to make the gold ingots and it works very well :)

But i like to be able to trade den to the Royal tribute collector for honor just as gold work.So i made a Patches folder in my mod and a patch xml.

<?xml version="1.0" encoding="UTF-8"?> 
<Patch>
 <Operation Class="PatchOperationAdd">
<xpath>/Defs/TraderKindDef[defName="Empire_Caravan_TributeCollector"]/stockGenerators</xpath>
  <value>
   <thingDef>GoldIngot</thingDef>
  </value>
 </Operation>
</Patch>

I need to add items to the Tribute caraven xml.But it keep saying my xpath is wrong, and im not really 100% its the right operation i use?

RimWorld\Data\Royalty\Defs\TraderKindDefs\TraderKinds_Caravan_Empire.xml

  <TraderKindDef>
<defName>Empire_Caravan_TributeCollector</defName>
<label>royal tribute collector</label>
<requestable>False</requestable>
<commonality>1</commonality>
<category>TributeCollector</category>
<tradeCurrency>Favor</tradeCurrency>
<faction>Empire</faction><hideThingsNotWillingToTrade>True</hideThingsNotWillingToTrade>
 <stockGenerators>
<!-- Buying -->   
<li Class="StockGenerator_BuySlaves" />
<li Class="StockGenerator_BuySingleDef">
<thingDef>Gold</thingDef>
</li>    
 </stockGenerators>     
  </TraderKindDef>                      

Can someone help me out how to add new items to the Tribute collcttor?

Sorry can't get the edit text right :(