Considering that dwarves are genetically predisposed to develop auromania, the scope of the problem is too big for individual interventions only. It is also not clear from your question how big the problem is and how destructive it to society. I am going to assume that auromania is seen as a pathology and is undesirable in this particular society.
I think that dwarves in charge have to take a multi-prong approach:
- cultural and social norms and values;
- healthcare system;
- individual therapy.
1. Discouraging gold-digging and hoarding
The dwarf government can use propaganda and various laws to achieve this.
For example, private property can be abolished and locks are forbidden. There can be horror stories about gold diggers who snatch children or follow their hallucinations to their death. The country can have festivals that encourage simple lifestyles, cooperation, sharing, and so on.
The culture would, probably, encourage highly structured activities, mostly in groups, where dwarves can support each other and take notice of any early symptoms of the disease. Rituals and routines are very helpful when dealing with mental issues.
If the problem is extreme and the society fails to deal with it, mass exodus and relocation to the grasslands/plains/forests can be considered. As with any addiction, no exposure to a thing that causes addiction helps to minimise the cravings.
2. Healthcare system
Since dwarves are genetically predisposed, it stands to reason to assume that auromania is not rare. The dwarf government can establish research facilities, universities, hospitals, rehabilitation centres, support groups, and a network of social workers to deal with the condition.
This infrastructure does not have to be high-tech. It can be envisioned in medieval terms. However, it should be centralised, well-funded, and based on science (whatever this science is in your world), not on superstition. The condition should be well-documented and remedies should be known, even if your society has not reached the level of genetics.
In a high fantasy setting, you can probably use monasteries as the foundation of this healthcare system. Professional associations (guilds, military orders, etc.) can also play a significant role. They would also provide structure to lives of recovering dwarves and psychological support.
3. Individual therapy
I am not expert on CBT, but I do not believe that it is universally helpful. When it comes to mental disorders there is no 'one-size-fits-all' approach. Depending on the stage, the severity of the symptoms, and personality, different approaches should be used. With this said, you still can focus on CBT in your work because it works for that specific dwarf.
I think that you should consider using CBT as a preventative measure (your teachers and priests can be trained in it) or for patients that exhibit only minor symptoms and are on early stages of auromania. If a dwarf completely lost touch with reality CBT alone can be ineffective and should be supplemented with medications and/or institutionalisation.
As for specific techniques, I would look into substance use disorders therapy and CBT for psychosis (these links are just examples of information that would be useful). Most of the techniques would focus on:
- establishing a connection with a patient (delusional patients are usually reluctant to cooperate and can be mistrustful);
- working on motivations (mixed success in this area);
- developing coping mechanisms that help to filter out hallucinations and reduce their number;
- increasing self-esteem;
- managing cravings;
- learning behavioural patterns and skills for better social adjustment;
- preventing relapses.
All of this will be applied on a case-by-case basis depending on the severity of symptoms, patients response, therapists training, and so on. For psychotic cases, psychological therapies are tailored to individuals.