How do I access deeply embedded json objects from a go map object?

I am new to go and I understand how to marshall json data into custom predefined Struct types but I'm currently working with a JSON set that can have dynamic keys & values with every call. I can marshall this dynamic data into a map/interface no problem but I'm a little lost with how to access the item that are deeply nested in an array.

Here is sample JSON that I'm working with from the USDOL website

    {
    "name": "osha-establishment",
    "count": 15,
    "frequency": "Manual Crawl",
    "version": 4,
    "newdata": true,
    "lastrunstatus": "success",
    "lastsuccess": "Mon Dec 08 2014 11:19:57 GMT+0000 (UTC)",
    "thisversionstatus": "success",
    "results": {
    				"est_search": [
    								{
    								"est_name": "Chipotle Mexican Grill",
    								"state": "MN",
    								"activity": {
    									"href": "https://www.osha.gov/pls/imis/establishment.inspection_detail?id=317911832",
    									"text": "317911832"
    								},
    								"opened": "11/20/2014",
    								"rid": "0552700",
    								"type": "Complaint",
    								"sc": "Partial",
    								"sic": {
    									"href": "https://www.osha.gov/pls/imis/sic_manual.display?id=44&tab=description",
    									"text": "5812"
    								},
    								"naics": "722110",
    								"vio": ""
    								},
    								{
    								"est_name": "Chipotle Mexican Grill, Inc.",
    								"state": "AZ",
    								"activity": {
    									"href": "https://www.osha.gov/pls/imis/establishment.inspection_detail?id=317801066",
    									"text": "317801066"
    								},
    								"opened": "07/14/2014",
    								"rid": "0950411",
    								"type": "Complaint",
    								"sc": "Partial",
    								"sic": {
    									"href": "https://www.osha.gov/pls/imis/sic_manual.display?id=44&tab=description",
    									"text": "5812"
    								},
    								"naics": "722211",
    								"vio": "2"
    								}
    							]
    			}
    }

I'd like to access the values of the sic keys in this JSON set.

Here is my broke go code:

package main
    
    import (
    	"encoding/json"
    	"log"
    	"net/http"
    )
    
    func main() {
    	resp, err := http.Get("https://www.kimonolabs.com/api/2oowt0xq?apikey=")
    
    	if err != nil {
    		// handle error
    	}
    	defer resp.Body.Close()
    
    	var result map[string]interface{}
    
    	dec := json.NewDecoder(resp.Body)
    	if err := dec.Decode(&result); err != nil {
    		// handle error
    		log.Println("This is an error")
    	}
    
    	log.Println(result["results"].(map[string]interface{})["est_search"], err)
    
    }

Any help showing me how to access the sic values would be greatly appreciated.

To decode JSON into an interface value, Decode stores one of these in the interface value:

1. bool, for JSON booleans
2. float64, for JSON numbers
3. string, for JSON strings
4. []interface{}, for JSON arrays
5. map[string]interface{}, for JSON objects
6. nil for JSON null

According to rules above,

• result["results"].(map[string]interface{})["est_search"] is
  []interface{} from JSON array (rule 4).
• iterate over
  result["results"].(map[string]interface{})["est_search"].([]interface{}), each item is map[string]interface{} from JSON object (rule 5).

Here is the example code, I ran it and it seems to work with that URL;

package main

import (
    "fmt"
    "encoding/json"
    "net/http"
)

func main() {
    resp, err := http.Get("https://www.kimonolabs.com/api/2oowt0xq?apikey=DTgSLPbfOPauuLCXTws5jquLQd0V7kBB")

    if err != nil {
        // handle error
    }   
    defer resp.Body.Close()

    var result map[string]interface{}

    dec := json.NewDecoder(resp.Body)
    if err := dec.Decode(&result); err != nil {
        // handle error
        fmt.Println("This is an error")
    }   

    for _, item := range result["results"].(map[string]interface{})["est_search"].([]interface{}) {
        fmt.Println(item.(map[string]interface{})["sic"])
    }   
}