Cannot implicitly convert type 'int' to 'OreMiner'

using UnityEngine.EventSystems;
using UnityEngine;
using UnityEngine.UI;
using System;
 
public class OreMiner : MonoBehaviour
{
 
    public float rayLength;
    public LayerMask layermask;
 
    public static int HematiteCol;
    public GameObject guiTextLink;
 
    private void Update()
    {
 
        guiTextLink.GetComponent<Text>().text = OreMiner.HematiteCol.ToString();
 
        if (Input.GetMouseButtonDown(0) && !EventSystem.current.IsPointerOverGameObject())
        {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
            if (Physics.Raycast(ray, out hit, rayLength, layermask))
            {
                Debug.Log(hit.collider.name);
 
 
                if (HematiteCol < 999)
                {
                    HematiteCol = HematiteCol + 1;
                }
            }
        }
    }
 
 
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
 
public class Upgrade1 : MonoBehaviour
{
    private Animation anim;
    public int IronOreNeeded = 50;
 
    private void Start()
    {
 
    }
 
 
 
    public void LetsUpgradeThis_One()
    {
        anim = gameObject.GetComponent<Animation>();
        anim.Play("text2");
    }
 
 
    public void Upgrade_one()
    {
        Debug.Log("Upgrade one Key pressed");
 
        OreMiner om = gameObject.GetComponent<OreMiner>();
 
        Debug.Log(om);
 
        if (om = IronOreNeeded)
        {
            LetsUpgradeThis_One();
            Debug.Log("Upgrading...");
        }
    }
}

if (OreMiner.HematiteCol == IronOreNeeded)